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It was twelve o'clock __________they finished the work.

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It was twelve o'clock __________they finished the work.
A.since
B.which
C.that
D.when
It was twelve o'clock __________they finished the work.
答案D
考生可能受强调句型的思维定势影响而选C.若选C,将其还原,则变成:They finished the work twelve o'clock.显然twelve o'clock前少了介词at,故错.因此可判定该题为定语从句,关系副词when在从句中作状语,it是指代时间的非人称代词,不属于强调句型中的it.