单项选择题

Tired ()she was，there was no hope of her being able to sleep．

A．if
B．though
C．even if
D．unless

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单项选择题

A survey of the opinions of students() that they also admit several hours of sittingin frontof the computer() harmful for one’s health．

A．show；are
B．shows；is
C．show；is
D．shows；are

单项选择题

A.maximum
B.minimum
C.possible
D.practical

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