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--- Where is Jack? I can’t find him anywhere.
--- He ______ his homework upstairs.
A.might have done B.must have doneC.might be doingD.must do
C
本题考查情态动词表猜测的用法。结合语境Where is Jack?可知说话人想知道Jack现在在哪,谈论的是现在的事,排除AB; “在楼上做作业”应是正在进行,排除D。
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