单项选择题

"None of them need do any work today, they" "Yes, all of them .

A．needn't; need
B．mustn't; must
C．need; needn't
D．need; must

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单项选择题He fell off his bike. ______ ,he had to stay at home for several days.

"None of them need do any work today, ______ they" "Yes, all of them ______.