Question

_________ that he had fallen behind, he tried to work harder.

A. Realize
B. Realized
C. To realize
D. Having realized

Answer 1

答案D
非谓语做状语时不定式表目的，过去分词表被动，现在分词表主动。本题中主语he与realize为主谓关系所以用现在分词做状语。“意识到落后了，他比以前更努力”选D。