___time,they would certainly come and help to do the work.

___time,they would certainly come and help to do the work.

题目
___time,they would certainly come and help to do the work.
这里答案用had they
这是一句虚拟的倒装句,但would certainly come and help 是一般现在时,那么从句要用过去时,为什么从句用过去完成时?
答案
Had they在这里等于if they had ,这里had 是的意思,they had time ,不是过去完成时
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