单项选择题

She tried hard, ______ she was unsuccessful.

A．therefore
B．but
C．or
D．unless
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单项选择题
If we ______ sooner, we might have got there.
A．started
B．had started
C．would have started
D．start
单项选择题
She had changed so much that I could hardly ______ her.
A．differ
B．find out
C．explain
D．recognize
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