单项选择题

The train arrived twenty minutes late, but we were not told what caused the ______.

A．late
B．delay
C．slow
D．last
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单项选择题
My father likes sports ______ my mother is interested in music.
A．when
B．as
C．while
D．although
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He ______ all the parks of this city because he has lived here for 20 years.
A．is familiar to
B．is familiar of
C．is familiar with
D．has been familiar
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