The driver has much experience of driving, and he behaved very calmly in the dangerous situation.
A. though
B. however
C. therefore
D. otherwise
网友回答
A. though
B. however
(答案→)C. therefore
D. otherwise
解析：句意：这个司机有非常丰富的驾驶经验，因此在危险的情况下，他非常冷静。四个选项的含义分别是：A. though 虽然，B. however然而，C. therefore因此，D. otherwise否则，所以选C。