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【单选题】

—Where have you___________, Mike?
I have ____________ to the library with my friends.

A.
been; gone
B.
gone; been
C.
been; been
D.
gone; gone
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举一反三

【单选题】workers in the factoryover two thousand.

A.
The number of; is
B.
The number of; are
C.
A number of; is
D.
A number of; are