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John _______ so hard on his project that he didn’t notice his mom enter the room.

A. works

B. has worked

C. was working

D. will work

C 【解析】選項A“約翰在他的項目上工作得如此努力以至于他沒有注意到他的媽媽進入了房間�！薄皐ork hard”指的是“工作努力”，這句話描述的事情發(fā)生在過去，表示的是他的媽媽進入房間的時候，當時他正在工作，所以沒有注意到。需要使用過去進行時來表示過去某段時間內正在進行的動作，所以這里要用“was working”，故選C。
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