Question

求解答，万分感谢

. I don’t think he ________ there as no one seems to have seen him.
A. could have been B. can be
C. might have been D. should be

Answer 1

前面I don"t think 已经肯定地表示 不认为了，因此没有might这种可能了，再看as后面引导的原因状语从句，as no one seems to have seen him，“因为好像没人见过他”，过去完成形式（表示已经发生了的事情），由此可以排除B和D，所以答案是A