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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This building is 4 times as (high) ______ as that one.
单项选择题
It is requested that every student ______ a paper on sustainable development.
A. Writes

B. wrote
C. writing

D. write
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