There were already five people in the car but they managed to take me as well . It a fortable journey .
A. can''t e
B. shouldn''t be
C. mustn''t have been
D. couldn''t have been
网友回答
A. can''t e
B. shouldn''t be
C. mustn''t have been
(答案→)D. couldn''t have been
解析：could表示对过去事情的推测，用于否定句或疑问句。