题目内容

在数据传输过程中,接收主机负责什么?

A. 封装
B. 带宽
C. 分段
D. 重组
E. 确认

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We _____ for three hours when we were allowed to enter.

A. waited
B. are waiting
C. wait
D. had been waiting

He wasn't exactly a stranger -- I _____ him once before.

A. had met
B. was met
C. meet
D. meets

He _____ nights next week.

A. is working
B. will be working
C. work
D. works

I _____ twenty next Sunday.

A. was
B. am
C. shall be
D. have been