单项选择题

Cement was seldom used in building the Middle Ages.

A. crudely

B. rarely
C. originally

D. occasionally
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单项选择题
We explored the possibility of expansion at the conference.
A. offered
B. included
C. accepted
D. investigated
单项选择题
The gar is a fish with a long, slender body and scales as hard as flint.
A．flat
B．straight
C．slim
D．fragile
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