Ask them to______ carefully the plane’s radio and radar system.

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问题 Ask them to______ carefully the plane’s radio and radar system.

选项 A、check on
B、check off
C、check out
D、check up

答案C

解析 check on"检查"；check off"验讫"；check out"结账后离开，检验，调试，核查"；check up"检查，检验，校对"。

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