—What about the protection?
—Let’s keep the surface        dirt by putting a cover over it.
A．far fromB．free fromC．a(chǎn)part fromD．a(chǎn)way from
B
考查短語：keep…free from使什么免受什么，句意：讓我們使表面免受灰塵通過在上面放上一個蓋。所以選B。
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