单项选择题

—I'm very tired.
—We really should stop ______ and go to bed.

A．to study
B．from studying
C．studying
D．of studying
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单项选择题
Barker became ______ in science when he was a little boy.
A．interests
B．interested
C．interesting
D．interest
单项选择题
Work hard, ______ you will fail in the exam.
A．although
B．and
C．or
D．unless
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