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5. In our class, when the bell rang and the taacher closed his book, it was a        or everyone to stand up.

A. signal           B. chance          C. mark          D. measure

 A


解析:

signal 信号; chance 机会; mark 记号; measure  措施。句中的it 代替“铃响时教师合上书”这件事,而“它”正是大家要起立的“信号”。

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