选D的原因是：
since用在完成时当中
所以主语时态应该是have/has + V过去分词
而It是现三单,be的过去分词是been
所以用it has been
has 可以缩写成's
所以最后是It's been a long time
选A的原因是：
选A有个固定句型 It is + 段时间 + since... / It has been + 段时间 + since...表示“从……起已有多长时间了” .两句型意思相 同, 前者是规范说法, 后者是口语说法.
-Oh,dear!Surprised to meet you here.
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