问题描述：
They have decided ______.
A.when did they go B.C.where they would go D.when would they go
但B……我在另外的一本练习里,也有一道类似的：They haven't decided when they will go .就一个肯定,一个否定,为什么一个用would,一个用will
A.when did they go B.C.where they would go D.when would they go
但B……我在另外的一本练习里,也有一道类似的：They haven't decided when they will go .就一个肯定,一个否定,为什么一个用would,一个用will
问题解答：
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