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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