单项选择题

I couldn't enter the lab because I had ______ the key in my office.

A．forgotten
B．left
C．missed
D．got
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单项选择题
I regret ______ you that we are unable to offer you employment.
A．informing
B．having informed
C．to inform
D．to have informed
单项选择题
______ the monitor has given you, Tom!
A．How good an advice
B．What a good advice
C．What good advice
D．How good advice
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