单项选择题

Cement was seldom Used in buildings in the Middle Ages.

A．crudely
B．rarely
C．originally
D．occasionally
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单项选择题
There is an abundant supply of cheap labor in this country.
A．a steady
B．a plentiful
C．an extra
D．a stable
单项选择题
They had a far better yield than any other farm miles away around this year.
A．goods
B．soil
C．climate
D．harvest
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