Don’t bother Tom, he is ______ with the experiment on water molecules in the lab.A.focusedB.fixedC.occupiedD.concentrated
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C解析试题分析：查固定词组。Be occupied with…忙于…句意：不要去麻烦Tom。，他正忙于在实验室里做实验。根据句意说明C正确。考点：考查固定词组点评：be occupied with…忙于….该词组与be busy doing sth忙于做sth