问题
选择题
The work is too hard for him. He__________ finish it on time.
A.can't
B.mustn't
C.shouldn't
D.needn't
答案
答案:A
情态动词的考察 句意为“这工作对他来说太难。他不可能按时完成”。 can't 用在否定句中表示“不可能”; mustn't“绝对不能,禁止”; shouldn't “不应该”needn't“不必”