单项选择题

Though it began raining, the peasants ______ rice.

A．went on to plant
B．went on planting
C．kept to plant
D．didn't stop to plant
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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
单项选择题
A big dog ran in front of my mother's car and she ______ stop very quickly.
A．ought to
B．had better
C．must
D．had to
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