The boy was heard ___ the piano at 8 yesterday evening.

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The boy was heard ___ the piano at 8 yesterday evening.
A.was playing B.play C.playing D.played
以及遇到这种题应该怎么考虑!有追分!

C.playing
因为用点时间状语的at 8 yesterday evening,表明动作当时正在发生着,并且是主动意义；故用现在分词做宾补；若是听到了全过程,在被动语态里要用不定式做宾补,但to的符号不能省略,故排除B.A是谓语动词形式,这里要求非谓语动词形式.D也是谓语动词形式,或是过去分词表被动和完成意义,故错误.
再问： They asked me to have a drink with them. I said that it ten years since I a good drink. A.is; enjoyedB.was; had enjoyedC.is; have enjoyedD.was; have enjoyed 那这个应该怎么理解呢》？？
再答： since引导的从句用一般过去时，选A，
再问：答案是B。。。
再答：噢，忽略了宾语从句的时态要和said一致，那么表示 enjoy的动作先发于was，只能把一般过去时的enjoyed进行时态倒移，变为过去完成时。

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