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

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

admin2014-09-24  23
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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