. that he had wasted a lot of time, Tom decided to work hard on his study.ARealizingB.

发布时间：2020-08-16 23:51:49

.     that he had wasted a lot of time, Tom decided to work hard on his study.
ARealizing
B. To realize
C. Realized
D. Having been realized

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(答案→)A. Realizing
B. To realize
C. Realized
D. Having been realized
解析：句意,由于汤姆意识到自己已经浪费了很多时间，所以他决定好好学习。非谓语动词作状语，主要看非谓语动词和主语的关系。现在分词作状语多表示主动,正在进行的动作,过去分词作状语，表示被动和完成.不定式作状语通常表未来，汤姆和意识到是主谓关系，故用现在分词作状语，表原因，故选A。
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