单项选择题

She pretended ______ nothing had happened.

A．as
B．if
C．as though
D．since
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单项选择题
Only under special circumstances ______ to take make-up tests.
A．are freshmen permitted
B．freshmen are permitted
C．permitted are freshmen
D．are permitted freshmen
单项选择题
She had sat in the same position for several hours so that her neck and legs became ______.
A．staff
B．stuff
C．stiff
D．stuffy
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