题目内容

________ I got on the bus, he got off.
A．AsB．WhileC．UntilD．Till
A

试题分析：句意：当我上车时，他下车了。As用作连词，意为“当……的时候”，故选A。While用作连词表示对比，后面跟延续性动词；故选A。
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