Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
It is widely believed that ________ human beings are descended from one common ancestor.
A.every
B.all of
C.every of
D.all
It is widely believed that ________ human beings are descended from one common ancestor.
A.every
B.all of
C.every of
D.all
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