单项选择题

_____ I admit that the problems are difficult, I don' t agree that they can' t be solved.

A．Suppose
B．Because
C．While
D．Until
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单项选择题
--I'm sorry for keeping you waiting. --Never mind. I ______ here only a few minutes.
A．came
B．have come
C．was
D．have been
单项选择题
The sun will burn you ______ you' re not careful.
A．if
B．and
C．but
D．unless
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