单项选择题

This problem is too hard for me to ______.

A．work at
B．work on
C．work out
D．work in
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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
单项选择题
The manager said he wanted ______ the report before he signed it.
A．to go by
B．to go for
C．to go off
D．to go through
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