【題目】—Why didn’t you get on the underground?

— I tried to, but it started moving _________ I could get on it.

A.beforeB.afterC.sinceD.if

【答案】A

【解析】

句意：——你為什么沒能坐上地鐵呢？——我嘗試了，但是在我登上之前，地鐵就開始移動了。

考查從屬連詞。before意思是“在……以前”，引導(dǎo)時間狀語從句；after意思是“在……之后”，引導(dǎo)時間狀語從句；since意思是“自從”，引導(dǎo)時間狀語從句；if意思是“如果”，引導(dǎo)條件狀語從句。根據(jù)題意可知沒坐上地鐵的原因是，在坐上之前，地鐵就開走了。所以要用before。故選A。

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