.________ that he had wasted a lot of time, Tom decided to work hard on his study.
A． RealizingB．To realizeC．RealizedD．Having been realized
A

試題分析：句意,由于湯姆意識到自己已經(jīng)浪費了很多時間，所以他決定好好學習。非謂語動詞作狀語，主要看非謂語動詞和主語的關系�，F(xiàn)在分詞作狀語多表示主動,正在進行的動作,過去分詞作狀語，表示被動和完成.不定式作狀語通常表未來，湯姆和意識到是主謂關系，故用現(xiàn)在分詞作狀語，表原因，故選A。
點評：非謂語動詞的正確選用，平時應注意記憶一些基本規(guī)則,被動語態(tài)主要是看動詞和主語是不是動賓關系.
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