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---Aha, you’re a chain smoker!
---Only at home. Nobody ______ that but you.

A.
discovered
B.
had discovered
C.
discovers
D.
is discovering

C
答句陈述的是客观事实，故用一般现在时态。

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We redheads are well known for our bad tempers. Now it seems there is scientific backing for our particular complaining as well.

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【小题1】The underlined sentence “ Get your hands dirty” means .