题目内容
11.People taking the therapy learn what scientists _____ for years-laughter is the best medicine.( )A. | know | B. | knew | C. | have known | D. | had known |
分析 接受治疗的人们懂得了科学家们已经了解多年的东西:笑是最好的良药.
解答 答案:C
题干中有时间状语for years多年来,表达从过去到现在的时间段,要用现在完成时态.故选C.
点评 现在完成时表示过去发生的动作对现在造成的影响或结果或表示过去的动作或状态持续到现在.用法有:过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作;表示过去发生的并且持续到现在的动作或状态.
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