单项选择题

We resolved the problem after group discussion.()

A. caused
B. met
C. solved
D. posed

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单项选择题

There is an abundant supply of cheap labor in this country.()

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

单项选择题

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

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

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