this medicine has had no effect on the patient为什么要加 had,has no effect不行吗?
人气：489 ℃ 时间：2020-01-28 20:13:29
解答
has had是现在完成时,表示过去发生的事情影响到现在
这句话要表达的是病人过去吃的药到现在仍然没有任何作用,所以用现在完成时
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