单项选择题

The rioters headed downtown,（）.they attacked the city hall.

A. since
B. as
C. whereupon
D. yet

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单项选择题

His inability to learn foreign languages was a(n) obstacle to his career（）

A. barrier
B. excess
C. carrier
D. impulse

单项选择题

My boss has always attended to the______of important business himself.

A. transaction
B. solution
C. translation
D. stimulation

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