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问题: 英语简单语法问题

动词填空:
1. The clock _____(not work) now.
A. isn't working B. doesn't work



解答:

选B,work在此处为习惯用法,它的否定要用助动词doesn't,意为闹钟坏了.
答案A为现在进行时态,表示一个延续性的动作,而闹钟不可能是正在坏,所以不能用isn't working,故而答案为B. doesn't work