单项选择题

I would have told him the answer had it been possible, but I ______ so busy then.

A．am
B．were
C．was
D．would be
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单项选择题
It is very important for the strong man to know that ______ strong he is, he cannot be the strongest.
A．whatever
B．whenever
C．whichever
D．however
单项选择题
The fact ______ he does so in so short a period of time challenges explanation.
A．why
B．that
C．what
D．which
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