According to the latest study,most traffic accidents     be prevented if drivers are careful enough.
#62242
A
must
B
can
C
have to
D
need
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—How much shall I pay for the telephone call? —You  _____. It's free.
#76026
A
mustn't
B
shouldn't
C
don't have to
D
can't
We _______ work very quickly.
#76098
A
don’t need
B
needn’t to
C
need not to
D
don’t need to