单项选择题

Most of the students failed in the final exam. It ______ easy.

A．can't be
B．shouldn't be
C．mustn't have been
D．couldn't have been
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It was not until she got on the bus ______ she remembered she had left her keys at home.
A．when
B．which
C．that
D．where
单项选择题
I prefer singing ______ drawing.
A．to
B．for
C．than
D．that
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