Inourclass,whenthebellrangandthetaacherclosedhisbook,itwasa&n

发布时间:2020-08-13 18:53:10

In our class, when the bell rang and the taacher closed his book, it was a        or everyone to stand upA.signalB.chanceC.markD.measure

网友回答

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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