How lucky he was! He involved in the murder.
A. must have been
B. can have been
C. could have been
D. would have been
网友回答
A. must have been
B. can have been
(答案→)C. could have been
D. would have been
解析：句意：他好幸运啊！他本来是被牵扯进谋杀案的。could have been本能够做某事，而实际没有做，故选C