2. 专升本
  3. If anything happens______the machine, please ask mechanic to repair it at once.

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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