--What about the protection of these new machines？
-Let's keep the surface ________ dust by putting a cover over them．（　　）

A．far from

B．apart from

C．free from

D．away from

【考點】介詞短語．

【答案】C

【解答】

【點評】

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發(fā)布：2024/5/27 14:0:0組卷：38引用：5難度：0.9

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A．up in the air	B．between the lines
C．to the point	D．over the moon

--What about the protection of these new machines？-Let's keep the surface ________ dust by putting a cover over them．（ ）