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
考查反義疑問句。本題的I heard是插入語，后面句子的主語是some patients，是復(fù)數(shù)形式；謂語動詞是experienced，是過去式；所以答案為C
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