单项选择题

Most parents would like their children to take an active part in school events, ______ those events do not interfere with their study.

A．lest
B．though
C．unless
D．provided
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He took down a square green bottle, ______ he poured into a dish.
A．its content
B．which content
C．the content of that
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It was with great delight that I read in your February ______ the letter to the editor written by Prof. Johnson.
A．magazine
B．version
C．copy
D．issue
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