题目内容

When Jim’s mother came in, he _______ his homework.
A．is doing    B．has done   C．was doing
C
句意：当吉姆的母亲进来时，他正在做他的作业。结合语境可知本句描述是的是过去某时正在进行的动作，故用过去进行时态。选Ｃ。
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