----- Your classroom is very clean.
----- Yes, it ______ every day.
A. is cleaned              B. cleans            C. is cleaning
A
A 考查被動(dòng)語(yǔ)態(tài)。教室被打掃，教室作主語(yǔ)，要用被動(dòng)語(yǔ)態(tài)，即be+過(guò)去分詞。
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