单项选择题

-- The experiment is of particular importance.
--I see. We won't carry on with it （） we can get the good equipment.

A. until
B. unless
C. whether
D. after

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The Intemet and the effect （） brought about did a lot of good to our daily life and work.

A. that
B. what
C. which
D. it
单项选择题
Help others whenever you can （） you will earn respect from others without difficulty.

A. and
B. or
C. unless
D. but
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