单项选择题

I find this treatment very ______ to my health.

A．advisable
B．beneficial
C．invaluable
D．worthy
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单项选择题
The student was worried about the job interview ______ he was well pre pared.
A．provided
B．unless
C．despite
D．even though
单项选择题
He demanded that we explain what was happening,
A．hadn't we
B．didn't we
C．hadn't he
D．didn't he
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