单项选择题

One of the boys in the class had a fever and he soon ______ other children.

A．infected
B．effected
C．affected
D．perfected
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单项选择题
It was not until she had arrived home ______ she remembered her appointment with the doctor.
A．that
B．when
C．and
D．where
单项选择题
I don' t understand why you ______ the same mistakes.
A．keep to make
B．keeping to make
C．keep on make
D．keep on making
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