问题
选择题
You ______ worry about their safety．They are old enough to take care of themselves.
A．mustn’t
B．needn’t
C．can’t
D．wouldn’t
答案
答案：B
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You ______ worry about their safety．They are old enough to take care of themselves.
A．mustn’t
B．needn’t
C．can’t
D．wouldn’t
答案：B