......................it with my own eyes, I would have never believed it.
A. Unless I had not seen B. Provided I had seen
C. If I had seem D. Had I not seen
giải
unless = if...not (mệnh đề unless luôn có dạng khẳng định)
eg: unless you take this umbrella, you will get wet
cấu trúc câu điều kiện loại 3
if + s + had (not) pii, s would have pii
had + s + (not) pii,... (had được đảo lên đầu câu)
eg: it i hadn’t seen it with my own eyes, i would have never believed it.
had i not seen it with my own eyes, i would have never believed it.
đáp án d (nếu không chứng kiến tận mắt, tôi sẽ không bao giờ tin điều đó)