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【单选题】
controls the CPU, the input, the output and the secondary memory devices.A.
System
B.
Application program
C.
Operating system
D.
Control unit
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举一反三
【简答题】My tooth is _____________ me.
【简答题】虚拟条件句规则总结
【简答题】动词填空（每空1分，共10分） 小题1:My tooth is aching; I’d better have it ________(pull) out. 小题2:My computer was _______(break) so I couldn’t read your two e-mails until toady. 小题3: He lay in bed with his eyes clos...
【单选题】— . — My tooth is killing me.
A.
How about you?
B.
What is your name?
C.
What’s wrong with you?
D.
How are you?
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