单项选择题

I don't know about him, ______ comment on him behind his back.

A．let alone
B．let go
C．leave alone
D．take leave
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单项选择题
I just met her ______ on the way home from the bookstore.
A．on purpose
B．by accident
C．in accident
D．in case
单项选择题
______ the difficulties associated with the project, we'll go on with it.
A．Given
B．In spite of
C．Thanks to
D．Because of
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