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【单选题】
以下哪个是国际上最是早流行的分时操作系统（）。A.
UNIX
B.
Linux
C.
Windows
D.
DOS
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举一反三
【单选题】His English, ______ used to be very poor is now excellent.
A.
which
B.
that
C.
it
D.
whom
【单选题】I love places _____________ the people are very friendly.
A.
who
B.
which
C.
where
D.
whom
【简答题】显示器屏幕上显示的信息每秒钟更新的次数称为 速率,它影响到显示器信息显示的稳定性。
【单选题】Tom is very helpful. He is the very person _ you can turn in trouble. [ ]
A.
from whom
B.
to whom
C.
to that
D.
from that
【单选题】听力原文：W: With whom did you go fo the Great Wall? M: My parents, my sister Mary and good friend Charile. How many people went to the Great Wall?
A.
Seven.
B.
Four.
C.
Five.
【单选题】She is becoming fat, _______ bothered her very much.
A.
which
B.
that
C.
it
D.
of whom
【单选题】The doctor __________ she sent her friend is very well known.
A.
by whom
B.
at whom
C.
whom
D.
to whom
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