--What about the protection?
---Let’s keep the surface ____ dirty by putting a cover over it.
A．far fromB．free fromC．a(chǎn)part fromD．a(chǎn)way from
B
考查短語(yǔ)：keep sth free from 使某物免受什么，句意：這個(gè)保護(hù)怎么樣？讓我們使表面免受臟東西通過在上面放一個(gè)蓋子。所以選B。
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