The order came that the medical supplies _ to Beijing for the H1N1 flu soon.A would be sent Bshould sent C be sent D must be sent为什么不用should be sent

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• 1.The order came that the medical supplies (be sent) to Beijing for the H1N1 flu soon.为什么不能用 must be sent?2.Considering his ability,he (might have done) better.为什么不能用 could have done?3.Liza (may) well noe wang to go on the trip —— she hates traveling.为什么不能用must?4.I wanted to go the party,but my mom simply (would) not let me out so late at night.为什么不能用could?5.When asked anout their opinins abour the schoolmaster,mant teachers would prefer to see him st
• The order came that the medical supplies _ to Beijing for the H1N1 flu soon.A would be sent Bshould sent C be sent D must be sent为什么不用should be sent
• The order came that the medical supplies _____ to Beijing for the Sars soon.A.would be sent B.should send C.be sent D.must be sent
• 若实数m，n，x，y满足m2+n2=a，x2+y2=b，则mx+ny的最大值（　　） A.a+b2 B.ab C.a2+b22 D.aba+b
• 已知实数x,y,m,n满足条件m2+n2=1,x2+y2=1,则mx+ny的最大值为