________ he finished writing his paper in such a short time surprised us all.
A．WhenB．Why C．That D．What
C
考查主語從句的連接詞。That引導(dǎo)主語，在句中不充當任何成分，沒有任何意思，只起連接作用，不能省略。When，why在句中都有實際的意思，what在句中要充當主語，賓語，表語或者同位語。結(jié)合句意可知C正確。句意：他在如此短的時間里寫完了論文讓我們都很驚訝。
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