单项选择题

Negro slavery, many claimed, was good for all（）

A．concerned
B．is concerned
C．to concern
D．that concerns

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单项选择题
The rioters headed downtown,（）.they attacked the city hall.

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