皮皮学，免费搜题
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【单选题】
目前在交换式局域网中,除通信线路外最主要、最基本的通信设备是 ?A.
交换机
B.
调制解调器
C.
BNC连接器
D.
I/O接口
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】In the preface ______the book, the writer thanked all the people who had helped him.
A.
of
B.
for
C.
in
D.
to
【单选题】This is _______ important book. It helped me a lot in ________ old days.
A.
a; an
B.
an; the
C.
the; an
D.
/; the
【单选题】The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.
A.
which
B.
when
C.
as
D.
where
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