【題目】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項意為“信號”；B項意為“機會”；C項意為“記號”；D項意為“措施”。句中it代替“鈴響時教師合上書”這件事，而它正是大家要起立的“信號”。

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