单项选择题

______ I admit that there are problems, I don't think that they cannot be solved.

A．Unless
B．Until
C．As
D．While
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单项选择题
I stared into the blackness and wondered if he was as aware of my presence as ______.
A．I was of his
B．I was of him
C．I did of him
D．I did of his
单项选择题
On a rainy day I was driving north through Vermont ______ I noticed a young man holding up a sign reading Boston .
A．which
B．where
C．when
D．that
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