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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单项选择题
As Edison grew ______, he became more and more interested in science.
A) elder
B) the elder
C) older
D) the older
单项选择题
the population is too large, we have to take measures to control the birth rate.
A) Although
B) Since
C) If
D) Until
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