Question

__________in the queue for half an hour,Tom suddenly realized that he had left his wallet at home.

A.To wait　?

B.Have waited?

C.Having waited?

D.To have waited ?

 

Answer 1

C

本题考查非谓语动词的用法。该分词短语补充成完整的句子是：When he had waited in the queue for half an hour,Tom suddenly realized that he had left his wallet at home.分词作状语，分词的逻辑主语就是句子的主语。由于分词短语的动作在先，所以用现在分词的完成形式。