单项选择题

The old gentleman never fails to help ______is in need of his help.

A．whom
B．who
C．whoever
D．whomever
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单项选择题
They couldn't______ him of his mistake.
A．advise
B．convince
C．persuade
D．believe
单项选择题
We'll be only too glad to attend your party ______we can get a baby-sitter.
A．so far as
B．provided that
C．unless
D．except that
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