单项选择题

Numerous attempts have been made to hide the truth().

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

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单项选择题

Cement was seldom used in building the Middle Ages.()

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

单项选择题

Loud noises can be annoying().

A. hateful
B. painful
C. horrifying
D. disturbing

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