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问题: What ______ your father _____ over thereHe is mending his bikeA. does...does B. is...do C. is...doin

解答:

该题通过答语的现在进行时态推断出问话也必须用现在进行时,your father为单数第三人称,谓语部分构成是is doing。
  [答案] C