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【单选题】

It will be hard for us to get up in the morning if we________ to bed too late.

A.
go
B.
went
C.
will go
D.
have gone
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参考解析:
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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