You know he is not going to let us leave early if we get the work done.
A. can't
B. may not
C. shouldn't
D. mustn't
网友回答
(答案→)A. can't
B. may not
C. shouldn't
D. mustn't
解析：考核情态动词的用法。每年必须至少一道。但这两年出的并没有以往难了，没有出现情态动词的特殊用法。只要记住这些情态动词的意思就行。本文说：如果我们不能把工作做完，他就不会让我们离开。选择A.