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

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单项选择题
She pretended（）nothing had happened.

A．as
B．if
C．as though
D．since
单项选择题
Mrs. Morrison invited us to the party, but our work（）, we politely refused her invitation.

A．not being finished
B．was not finished
C．not having finished
D．had not been finished
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