【題目】—Did you catch the first subway this morning?

—No, I didn’t. It had started moving __________ I could get on it.

A. before B. since C. after D. as soon as

【答案】A

【解析】試題分析：句意：-今天早上你趕上第一列地鐵了嗎?-不，我沒有。在我上車之前它就開始移動了。before在……之前；since 自從；after在……之后；as soon as 一……就……。根據(jù)句意可知，說話人沒有趕上地鐵，因此這里是在上車之前，地鐵就開動了。故選A。

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