this medicine has had no effect on the patient为什么要加 had,has no effect不行吗?

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• the drug has had immediate effect on patient 前面的为什么是has 而后面的为什么是had?谢谢赐个教个 在下 自学英文中 此题不甚解 虽然没有分数 交流知识 感激之
• The patient has tried quite a few kinds of medicine,but ______ had any effect on his disease.A.none B.nothing C.neither D.no one
• the patient has tired quite a few kinds of medicine ,but ___had any effect on his disease.A.noneB.nothingC.neither D.no one问其他几个问什么不对?
• 1、Mr Ford still loves the young lady ____he met at the railway station ten years ago.A.where B.who C.when D.there为什么不选C呢?2、The book was written in 1946,_____the education system has witnessed great changesA.when B.during when C.since then D.since when为什么要加since?A不可以吗?3、They asked me to have a drink with them.I said it was 9 years since I ___ a good drink.A.enjoyed B.was enjoying C.had enjoyed D.had been enjoying 为什么选C不选A?第一题选项打错了，应该是：A、that B.where Cw
• this medicine has had no effect on the patient为什么要加 had,has no effect不行吗?
• the drug has had immediate effect on patient 前面的为什么是has 而后面的为什么是had?
• the patient has tired quite a few kinds of medicine ,but ___had any effect on his disease.
• The patient has tried quite a few kinds of medicine,but ______ had any effect on his disease.
• this medicine has had no effect on the patient为什么要加 had,has no effect不行吗?
• I why he is late for school again.a.want b.knew c.wonder d.think I后面填什么,为什么
• What happened _______the young boy just now?在横线上填上正确的介词