Research shows pet owners visit the doctor less often and experience less sleeping difficulties tha——青夏教育精英家教网—

摘要： Research shows pet owners visit the doctor less often and experience less sleeping difficulties than without a four-legged friend. A. ones B. those C. who D. that

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Research shows pet owners visit the doctor less often and experience less sleeping difficulties than ______ without a four-legged friend.

A. ones B. those C. who D. that

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