单项选择题

Cement was seldom used in buildings of the Middle Ages.()

A. slightly
B. rarely
C. originally
D. occasionally

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单项选择题
He made an immense amount of money in business().

A. large
B. small
C. limited
D. little
单项选择题
There is an abundant supply of cheap labor in this country.()

A. steady
B. plentiful
C. an extra
D. a stable
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