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?
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• 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.
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