--How ______ he often come to school-- ______ foot.

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问题 --How ______ he often come to school-- ______ foot.

选项 A、does; On
B、is; By
C、do; By

答案A

解析 主语为第三人称单数,一般疑问句助动词用does。On foot表示“步行”。
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