If anything happens______the machine, please ask mechanic to repair it at once.

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问题 If anything happens______the machine, please ask mechanic to repair it at once.

选项 A、about
B、for
C、on
D、to

答案D

解析 如果机器有任何问题,请找技工来修理。考点:词组搭配,happen to sth.。
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