单项选择题

The medicine had no ______on him.

A．affection
B．effect
C．affect
D．effective
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单项选择题
Fond of singing as she is, she is ______a good singer by profession.
A．everything but
B．something but
C．nothing but
D．anything but
单项选择题
Only if you work hard every day ______pass the exam.
A．you can
B．may you
C．you must
D．must you
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