I ____ have been there, but I ____ not find the time

A.could; must

B.must; could

C.should; could

D.should; would

答案及解析： C

解析：

试题分析：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。

考点：考查情态动词