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i am not happy because i found my mother _______ my things y

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i am not happy because i found my mother _______ my things yesterday
A looking though
B is looking though
C was looking
D looked for
该选哪个?为什么?
i am not happy because i found my mother _______ my things y
A
分词作状语
再问: 为什么不选B?
再答: 因为前面已有谓语动词FOUND
另外,主句是一般过去时FOUND, 从句要用相应的过去时( B 是现在进行时)