单项选择题

______ in thought, he almost ran into the car in front of him.

A．Losing
B．Having lost
C．Lost
D．To lose
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单项选择题
We won't go outing if it ______ tomorrow.
A．rains
B．will rain
C．is raining
D．rain
单项选择题
If we work with a strong will, we can overcome any difficulty, ______ great it is.
A．what
B．how
C．however
D．whatever
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