求一答案hesaidthatthedrivermusthavehadanaccident;otherwisehebythen.a)wouldhavearrivedb0musthavearrivedc)shouldarrived)wouldarrive能不能帮我分析一下,谢谢

Question

求一答案
he said that the driver must have had an accident;otherwise he_____by then.
a)would have arrived
b0must have arrived
c)should arrive
d)would arrive
能不能帮我分析一下,谢谢

Answer 1

it's A ,because c and d are not past tense and this setence is a past tense structure,and B is must,must means have to,it doesnt make any sense if it's must here.so the best answer is A