He have been here two hours ago, but he hasn’t by now.
A. might; turned to
B. should; turned up
C. could; turned in
D. must; turned on
网友回答
A. might; turned to
(答案→)B. should; turned up
C. could; turned in
D. must; turned on
解析：should have done 本应该做某事，而实际上没有做，turn up出现，句意：他两个小时本应该出现的，但是他现在还没有出现。所以选B。