单项选择题

It was with great delight that I read in your February ______ the letter written by Prof. Wu.

A．issue
B．copy
C．printing
D．periodical
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单项选择题
______ the balcony, it could have saved me a lot of troubles.
A．Have I known
B．Had I known
C．I have known
D．I had known
单项选择题
We would keep you ______ of how our work was going on.
A．know
B．noticed
C．recognize
D．informed
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