单项选择题

You look tired.You_________all day long.

A.must have been working
B.might be working
C.should have been working
D.should have worked
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单项选择题
As a _________of fact,talking to a friend is nice, but being alone is also enjoyable.
A.thing
B.business
C.matter
D.affair
单项选择题
水的臭氧消毒的主要缺点是（ ）。
A.会产生异味
B.没有余量
C.消毒效果不强
D.会产生“三致”物质
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