In our class, when the bell rang and the teacher closed his book, it was a ______ for everyone to stand up.
A．signalB．chanceC．markD．measure
A.
考查名詞。根據(jù)句意可知打鈴及老師合上書本，這是下課的暗示，選項中只能選擇signal。chance“機會”，mark“分數(shù)，痕跡”，measure“方法，措施”。
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