单项选择题

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

A．is
B．are
C．though
D．if

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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
单项选择题
— Have you finished reading the books borrowed from the library — Yes, and Ive returned them. Now () is left at home.

A．nothing
B．none
C．no one
D．neither
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