单项选择题

I wonder what has happened to Annie, Shehave been here by now.

A．shall
B．can
C． should
D．need
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单项选择题
—I cant work out this problem.—. Lets ask the teacher.
A．So can I
B．Neither can I
C．So do
D．Nor do I
单项选择题
In China as well as many other countries around the world，greathave been made to reduce the amount of carbon emission.
A．affects
B．efforts
C． affords
D．effects
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