题目内容
--Shall Mary come and play computer games?
--No,__________ she has finished her homework.
--No,__________ she has finished her homework.
| A.when | B.if | C.unless | D.once |
C
本题只要理解了句意就能很容易地选出unless。句意为:“玛丽要来打电脑游戏吗?”“不,除非她完成了作业。”
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