问题

You ______ walk to close to the edge of the hill because you might fall and hurt yourselves.
A:mustn't
B:must
C:can
D:needn't;
B:must
C:can
D:needn't;
正确答案是:
同类题型
She looks sad. Could you please tell me ____ that prevents her from being as happy as before
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Could you tell us _______ —- About five minutes.
Jenny, will you please _______ my dog for three days— Yes, of course.
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