题目内容

The improvements in technology have ______the prices of computer considerably in recent months.

A. brought back
B. brought down
C. brought on
D. brought up

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据报导明年那里要修建一条新铁路。

他们告诉我，到年底他们在一起工作就要满三十年了。

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A. called in
B. called off
C. called on
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今天早晨来找小杨的那个人你认识吗？