【題目】Sorry, mom. I can’t answer the door. I ________ the fish.

A. feed B. fed C. feeding D. am feeding

【答案】D

【解析】句意：媽媽，對(duì)不起。我無法開門。我正在喂魚。根據(jù)I can’t answer the door.可知我現(xiàn)在正忙于別的事，無法開門，故用現(xiàn)在進(jìn)行時(shí)be doing，故選D。

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