问题描述：
_l toured the Great Wall,l was deeply impressed with the beautiful scenery.
A.For the first time B.At first
C.lt was the first time D.The first time
为什么选C不选D,
A.For the first time B.At first
C.lt was the first time D.The first time
为什么选C不选D,
问题解答：
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