问题
选择题
The driver has much experience of driving, and _____ he behaved very calmly in the dangerous situation.
A．though
B．however
C．therefore
D．otherwise
答案
答案：C
题目分析：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。