I have been there, but I not find the time.
A. could; must
B. must; could
C. should; could
D. should; would
网友回答
A. could; must
B. must; could
(答案→)C. should; could
D. should; would
解析：考查情态动词：句意：我本来应该在这儿的，但是我找不到时间。第一空用should have done本应该做…却没有，must have done过去一定做了，could have done过去本来可以做…，第二空表示事实：用could能，must必须，would过去常常，会，选C。