题目内容

It was not until 1870 ______ President Ulysses Grant made Christmas a federal holiday.

A. which
B. what
C. that
D. how

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If I_____ you，I would have accepted the job offer then．

A. had been
B. were
C. was
D. am

Thecommitteerejectedthesuggestionthatthehouse___onthissite.

A. bebuilt
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一个IP地址由（）和主机地址两部分构成

A. 广播地址
B. 多址地址
C. 网络地址
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互联网上每一台主机都有自己的IP地址，IPV4结构由4部分，总共（）位地址构成。

A. 8
B. 16
C. 32
D. 128