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:
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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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