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
B. what
C. that
D. how
If I_____ you,I would have accepted the job offer then.
A. had been
B. were
C. was
D. am
Thecommitteerejectedthesuggestionthatthehouse___onthissite.
A. bebuilt
B. wouldbebuilt
C. werebuilt
D. arebuilt
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
D. 子网掩码