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
You mustn't be angry with her. It wasn't her ______.
A．defect
B．shortcoming
C．evil
D．fault
单项选择题
His goal is not to become a sportsman ______ a champion in a certain field.
A．but rather became
B．but rather to become
C．but rather becoming
D．but rather to becoming
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