单项选择题

His idea to solve the problem is really original().

A. creative
B. great
C. practical
D. perfect

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单项选择题
Numerous attempts have been made to hide the truth().

A. Many
B. Successful
C. Effective
D. Unsuccessful
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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