题目内容

数据链路层在进行通信时的主要步骤有哪些?

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Itwastheboy_____hadbeeninprison_____stolethemoney.

A. who,where
B. that,how
C. who,that
D. that,which

Itwaswhenshewasabouttogotobed_____thetelephonerang.

A. since
B. as
C. that
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ItwasatChristmas_____JohngaveMaryahandbag.

A. before
B. who
C. that
D. when

“Howwas______theydiscoveredtheentrancetotheundergroundpalace?”

A. itthat
B. hethat
C. itwhen
D. hewhich

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