问题
单项选择题
He said, "We （）be proud of working hard. We mustn't be lazy. "
A. must
B. needn't
C. may
D. can't
答案
参考答案：A
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He said, "We （）be proud of working hard. We mustn't be lazy. "
A. must
B. needn't
C. may
D. can't
参考答案：A