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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单项选择题
At first, the __________ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.
A．transaction
B．transmission
C．transformation
D．transition
单项选择题
The capital intended to broaden the export base and ___________ efficiency gains from international trade was channeled instead into uneconomic import substitution.
A．secure
B．extend
C．defend
D．possess
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