题目内容
（请给出正确答案）
[主观题]
It has been years __________ I returned home.[A]after [B]that [C]since [D]when
It has been years __________ I returned home.
[A]after
[B]that
[C]since
[D]when
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A. was
B. is
C. will be
D. has been
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