问题描述：
You should have watered the tree,_______?
A.shouldn't you B.didn't you C.don't you D.haven't you
为什么答案是B,请说明原因.急呀,
A.shouldn't you B.didn't you C.don't you D.haven't you
为什么答案是B,请说明原因.急呀,
问题解答：
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