单项选择题

Alice, ______ where to find the book, asked her mother where the book was.

A．not to know
B．never to know
C．with no knowledge
D．not knowing
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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
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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