I usually walk to school, but bus when it rains. A. in B.by C. with D.at 牛津8B unit ——青夏教育精英家教网—

摘要：I usually walk to school, but bus when it rains. A. in B.by C. with D.at 牛津8B unit 1 Reading练习

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I usually walk to school, but ____ bus when it rains.