单选题
He has just finished fixing the door, and it looks as though______a very hard job
A、
it must have been
B、
it was
C、
to be
D、
it must be
【正确答案】
B
【答案解析】
解析：句意：他刚刚把门固定好，看上去这是一份很困难的工作。由题干中的“as though”可知，本题考查的是虚拟语气。只有B选项符合题意。
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