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We have a lot of apples.You ______these.

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We have a lot of apples.You ______these.
A.needn't buy B.needn't have bought
C.don't buy D.didn't buy
我也选的A,
但是答案写的是B.
所以才问的...
选B,needn't have done 表示本来不应该做的,但去做了(瞎起劲),就是这个意思.看到这种题目,肯定选这种答案.