He talks as if he______really_______it by himself.
A. has...done
B. had...done
C. did...不填
D. 不填... did
查看答案
He is ________ I.
A. so tall as
B. so tall than
C. notso tall as
D. tall as
His father is _____the child.
A. three times tall than
B. three times tall as
C. as three times tall as
D. three times as tall as
PPP支持下列哪2种网络层协议?AB
A.IP
B.IPX
C.RIP
D.FTP
以下属于点到点连接的链路层协议的两项是（ ）BD
A.X.25
B.HDLC
C.ATM
D.PPP
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