You drink or eat while walking down the stairs. A. are supposed to B. aren't supposed.——青夏教育精英家教网—

摘要： You drink or eat while walking down the stairs. A. are supposed to B. aren't supposed. C. aren't supposed to D. are supposing to

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You_______ drink or eat while walking down the stairs.

A. are supposed to B. aren't supposed.

C. aren't supposed to D. are supposing to

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