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In which of these sentences is a verb wrongly used?

A. I haven't smoked a cigarette for six months
B. I want to go but haven't finished my work yet
C. I am sorry but I haven't known you were ill
D. I must go back to the house, I haven't locked the door
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CUUnit-Cইংরেজি - গ্রামার ও ভোকাবুলারিTense and Sequence of TenseTense and Sequence of Tense (Topic Practice)CU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
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সঠিক উত্তরঃ C. I am sorry but I haven't known you were ill
Explanation: