in the queue for half an hour, Tom suddenly realized that he had left his wallet
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________ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
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A．To waitB．Have waitedC．Having waitedD．To have waited
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答案：
解析：本题考查非谓语动词.由题干结构看出，此处需填入非谓语动词，而B项只能作谓语，所以不对；再由题意得知，此处表示时间关系，所以应选C项，而A项作目的状语，D项一般不作状语。 |