Can you tell us what horses ?A. feed onB. live onC. feed byD. live by

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A. feed on
B. live on
C. feed by
D. live by
解析：考查词组：A. feed on以…为主食（指动物）B. live on以,..为主食（指人）C. feed by这不是个短语D. live by靠…生存，句意：你能告诉我们马以什么为主食吗？选A。