单项选择题

When her report came, she found that she had received three "D' s" and two "C' s". Soon she began to recall some of the errors she______ on her test.

A．should have made
B．might have made
C．would have made
D．could make
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单项选择题
Talk to anyone in the drug industry,______ you'll soon discover that the science of genetics is the biggest firing to hit drug research since penicillin was discovered.
A．or
B．and
C．for
D．so
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
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