单项选择题

Student A: ______ Student B: What"s the problem Student A: I switched on the power five minutes ago, and now it doesn"t show up.

A．Are you the owner of the computer here
B．Do you know this computer
C．What can I do for you
D．Could you help me
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单项选择题
To get a high score ______.
A．working hard is needed
B．one must work hard
C．working hard is very important
D．requirement is what is needed
单项选择题
【B9】
A．cause
B．enable
C．make
D．get
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