Your trousers dirty.You must have washed. A.is;il B.are;it C.are;them D.is;them——青夏教育精英家教网—

摘要：Your trousers dirty.You must have washed. A.is;il B.are;it C.are;them D.is;them

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Your trousers____ dirty.You must have____ washed.