问题补充：
— There were already five people in the car but they managed to take me as well .
— It a comfortable journey .
A. can\t be
B. shouldn\t be
C. mustn\t have been
D. couldn\t have been
答案：
A. can\t be
B. shouldn\t be
C. mustn\t have been
(答案→)D. couldn\t have been
解析：对过去推断要用“情态动词+have +p . p”结构。C项中 must 不能用于否定。
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