单项选择题

I failed in the final examination last term and only then ______ the importance of studies.

A．I realized
B．I had realized
C．had I realized
D．did I realize
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单项选择题
I'm going to the supermarket this afternoon. Do you have anything ______
A．to be buying
B．to be bought
C．for buying
D．bought
单项选择题
Along with the letter was his promise ______ he would visit me this coming Christmas.
A．which
B．that
C．what
D．whether
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