单项选择题

He works too hard. That's ______ is wrong with him.

A．why
B．how
C．where
D．what
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单项选择题
I'm a college student. If I hadn't been enrolled to college, I probably ______ in a factory now.
A．would be working
B．would have worked
C．am working
D．work
单项选择题
It's too expensive for me. I can't ______ it.
A．spend
B．cost
C．afford
D．pay
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