题目内容

I heard that some patients who had undergone laser eye surgery experienced sudden losses of vision, ______?
A.didn’t IB.hadn’t theyC.didn’t they D.isn’t it
C
考查反义疑问句。本题的I heard是插入语,后面句子的主语是some patients,是复数形式;谓语动词是experienced,是过去式;所以答案为C
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