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题目内容
（国家开放大学理工英语21）
Mike ________ his computer and checked his E-mail.
单选题 (10 分) 10分
A.
turned on
B.
turned off
C.
turned up
单选题 (10 分) 10分
A.
turned on
B.
turned off
C.
turned up
参考答案
