题目内容

It is essential that he _____ us informed.

A. has kept
B. keeps
C. keep
D. keeping

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

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

A. had been
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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
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