题目内容
【题目】In our class,when the bell rang and the teacher closed his book,it was a ________for everyone to stand up.
A.signal
B.chance
C.mark
D.measure
【答案】A
【解析】A项意为“信号”;B项意为“机会”;C项意为“记号”;D项意为“措施”。句中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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