问题补充:
I use a clock to wake me up because at six oclock each morning the train comes by my house.
A. couldn
B. mustn
C. shouldn
D. needn
答案:
A. couldn
B. mustn
C. shouldn
(答案→)D. needn
解析:此处考查情态动词,needn’t+动词原形表示:没有必要做某事。句意:我没有必要用闹钟唤醒我,因为每天早上6点火车都经过我的房子。
【考点定位】考查情态动词的用法。
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