题目内容
Mary was waiting for the train on the platform she noticed an old friend of hers coming towards her.
A. while B. when C. as soon as D. after
答案:B
解析:
解析:
本题测试when句型。当when的前一句用过去进行时时when表示“此时(at the time)”而且有突然性。本题意为:“玛丽在站台等火车时偶然注意到她的一位老朋友朝她走来。”本题如果用while,两句应该调换位置,但缺少了偶然性。Mary noticed all old friend of hers coming towards her while she wasお waiting for the train on the platform。
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