单项选择题

--When did you become a volunteer
--Two years ago. I ______ this group since then.

A. have joined
B. joined to
C. have been in
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This trolley bus will ______ you to the shopping mall directly.
A. bring
B. take
C. move
单项选择题
She won ______.
A. the girl's 400-metres race
B. the girl's 400-metre races
C. the girl's 400-metre race
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