When the teacher came in, all of us _______.

A．stopped talking B．stopped to talk C．stop talking D．stop to talk

A

解析試題分析：句意是：當(dāng)老師進(jìn)來時我們都停止了說話。根據(jù)賓語從句時態(tài)一致原則，所以stop用過去式；stop to do是開始做正在做的之外的事的意思，stop doing 是停止正在做事情。根據(jù)句意是停止不說話了，故選A。
考點(diǎn)：考查動詞時態(tài)和非謂語動詞。

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