单项选择题

A. I’m Mary.
B. Can I help you
C. Sorry, the line is busy.
D. Sorry, he’s not in.
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It is requested that every student ______ a paper on sustainable development.
A. Writes

B. wrote
C. writing

D. write
单项选择题
A. Sunbathing. B. Having a bath.C. Watching the sunset. D. Swimming.
A. Sunbathing.
B. Having a bath.
C. Watching the sunset.
D. Swimming.
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