A few years ago it________died that certain cells of human body never___________
a. had been found, dies.
b. is found, died C.was found, die. d. has been found,
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A few years ago it________died that certain cells of human body never___________
a. had been found, dies.
b. is found, died C.was found, die. d. has been found,
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Answer:
a. had been found, dies.
answer: it has been found that (option d)