问题
选择题
—What about the protection?
—Let’s keep the surface dirt by putting a cover over it.
A．far from
B．free from
C．apart from
D．away from
答案
答案：B
考查短语：keep…free from使什么免受什么，句意：让我们使表面免受灰尘通过在上面放上一个盖。所以选B。
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