Scientists say it may be a few years___it is possible to test new medicine on patients

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• scientists say it may be five or six years before it is possible to test this medicine on human patients科学家对药品先要进行反复试验后才能用于病人身上 这里的before为什么提前?为什么不直接说it is possible to test this medicine before on human patients?
• 1._____ my love of landscape,nothing could persuade me to spend another day in the Highlands.A.But for B.For all C.Above D.Except for2.Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.A.since B.before C.after D.when3.Hurry up,____ we'll be late for the film.A.and B.but C.so D.or4.___ Monday___ Tuesday is OK—I will be free then.A.Either; or B.Neither; nor C.So; that D.Both; and5.We ran to the trees
• Scientists say it may be a fe years___it is possible to test the new medicine on patients.
• scientists say it may be five or six years____it is possible to test medicine to human paients
• scientists say it may be five or six years before it is possible to test this medicine on human patients科学家对药品先要进行反复试验后才
• Scientists say it may be a few years___it is possible to test new medicine on patients
• Scientists say it may be five or ten years__it is possible to test this medicine on human patients.
• 求助几道英语单选+讲解1.—How about eight o'clock outside the cinema?—Taht____ me fine.A.fits B.meets C.satisfies D.suits2.Scientists say it may be five or six years____ it is possible to test this medicine on human patients.A.since B.after C.before D.when 这道题为什么不能选A...3.You should try to get a good night's sleep___ much work you have to do.A.however B.no matter C.although D.whatever4.___ with the size of the whole earth,the biggest ocean does not seem big at all
• 英语22,6.Scientists say it may be five or ten years ____ it is possible to test this medicine on human patientsA.beforeB.sinceC.afterD.when满分：4 分17.You can not be ___ grateful to him; in fact,you should owe your success to himA.soB.veryC.tooD.least满分：4 分18.When she wants to go out,he wants to stay in,and _____A.instead ofB.vice versaC.in turnD.in brief满分：4 分19.We all know that he _____ get angry when people disagree with himA.devotes toB.submits toC.att
• Scientists say it may be five or six years ____ it is possible to test this medicine on human patients.
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