Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
______ eighteen century, people began to realize that certain chemical are affected and changed by light.
A.By the
B.The
C.It was the
D.That in the
______ eighteen century, people began to realize that certain chemical are affected and changed by light.
A.By the
B.The
C.It was the
D.That in the
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