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
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单项选择题
He could not account ______ his foolish mistakes.
A．of
B．on
C．about
D．for
单项选择题
But in this letter of reply he demanded that the creditor ______ him a formal letter of apology.
A．could write
B．write
C．would be writing to
D．was going to write
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