—I visited China year.
—That interesting.
A. should have been
B. can be
C. must be
D. must have been
网友回答
A. should have been
B. can be
C. must be
(答案→)D. must have been
解析：考查情态动词用法。A本不应该做某事实际上却做了。B可能；C一定…；D一定做了。Must have done表示对过去情况有把握的肯定的推测。句意：—我去年去了中国。—那一定很有趣。本句是对过去情况有把握的肯定推测，故选D项。