The family piano was before Jack’s mother asked him to move it. It still didn’t move, because .

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问题 The family piano was ______ before Jack’s mother asked him to move it.
It still didn’t move, because ______.

选项 A、the piano was too heavy
B、Jack didn’t work hard
C、neither of them worked hard
D、both of them pushed the piano

答案D

解析他们不能搬动钢琴的原因是两人各站一头，相对而推，其力对消，并不是钢琴太重，也不是不使劲。

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