单项选择题

It is too soon to say how much. I have ______ from these courses.

A．benefited
B．obtained
C．improved
D．recovered
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单项选择题
______ you need any further information, please feel free to write to me.
A．Shall
B．Should
C．Will
D．Would
单项选择题
But for the accident, we ______ the task much earlier.
A．should finish
B．should have finished
C．would finish
D．shall have finished
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