单项选择题

I missed a very good chance. I ______ that work when it was offered.

A．should take
B．had taken
C．should have taken
D．took
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单项选择题
She liked to stay at home. She had previously traveled seldom and then only ______.
A．When necessary
B．which necessary
C．what possible
D．while possible
单项选择题
Little ______ about his own safety, though he was in great danger himself.
A．does he care
B．did he care
C．he cared
D．he cares
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