单项选择题

The heavy rain()for several days and all the roads were flooded.

A．went up
B．kept on
C．fell down
D．broke down

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As () known to all, language has been developed through social contacts.

A．is
B．are
C．though
D．if
单项选择题
He is the only suitable man () I can find for this job.

A．who's
B．whose
C．that
D．what
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