题目内容:
He ______ sleep,although he tried to. One cup of coffee in the late afternoon caused him tostay awake almost all night.
A.wouldn't
B.shouldn't
C.couldn't
D.mustn't
参考答案:
答案解析:
He ______ sleep,although he tried to. One cup of coffee in the late afternoon caused him tostay awake almost all night.
A.wouldn't
B.shouldn't
C.couldn't
D.mustn't