The driver could have survived, but he the seat belt.
A. had been fastening
B. hadn’t fastened
C. was fastening
D. didn’t fasten
网友回答
A. had been fastening
B. hadn’t fastened
C. was fastening
(答案→)D. didn’t fasten
解析：考查时态。本题陈述过去的事实，故用一般过去时。句意：司机本可以活下来的，但他没有系安全带。故D正确。