It sounded like something was wrong with the car’s engine then, they would have carried on their journey.
A. otherwise
B. therefore
C. meanwhile
D. besides
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(答案→)A. otherwise
B. therefore
C. meanwhile
D. besides
解析：句意：这听起来就象当时汽车发动机出了问题，否则他们就会继续旅行。四个选项的含义分别是：A. otherwise否则，B. therefore 因此，C. meanwhile 同时，D. besides此外，这里用otherwise相当于虚拟条件句：If something hadn’t been wrong with the car’s engine then,所以选A。