单项选择题

The thief was caught ______ he was leaving the shop.

A．after
B．as
C．before
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单项选择题
-- What's one-fourth and a half, do you know-- Yes, it's ______.
A．three-fourths
B．three-fourth
C．three fours
单项选择题
The suitcase looks too heavy for the lady to carry. Let's go to help her, ______
A．do we
B．shall we
C．will you
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