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

試題分析：句意：當我上車時，他下車了。As用作連詞，意為“當……的時候”，故選A。While用作連詞表示對比，后面跟延續(xù)性動詞；故選A。
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