单项选择题

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

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

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They'd paid a substantial bribe to the surgeon in Rio.()

A. meager
B. stern
C. subtle
D. steep
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The economy continued to exhibit signs of decline in September.()

A. play
B. show
C. send
D. tell
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