问题补充:
(·全国卷Ⅰ)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:选D考查情态动词。句意:我不需要用闹钟叫自己起床,因为每天早上六点都会有一列火车经过我家门口。应选“不需要”,即needn 。