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I don't think Kate saw me.She __a sweater for her sister

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I don't think Kate saw me.She __a sweater for her sister
A.has just chosen
B.had just chosen
C.is choosing
D.was just choosing
说下原因.
1l:D是被动语态!应该是主动语态吧!
I don't think Kate saw me.She __a sweater for her sister
A和B都是现在完成时.前面saw是过去式所以后面也要用过去式.所以A句型错了.那么B的句型是对的,可是前面是,我认为她看不见我.那么完成时态是已经完成的,所以不符合前一句.排除,剩下C和D.它们都是进行时,C:前面说过是用过去时,所以is应该变成was.那么答案就是D