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
In order to make good lemonade with one cup of lemon juice, we should add to it __________.
A．two spoons of sugar and two quarts of water
B．one cup of sugar and two quarts of water
C．one cup of sugar and one quart of water
D．one spoon of sugar and one quart of water
单项选择题
No one, except his two best friends, __________ where he is.
A．know
B．knows
C．to know
D．knowing
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