The family on time but their car had a flat tyre on the halfway.A. would arriveB. could

问题补充：

The family on time, but their car had a flat tyre on the halfway.

A. would arrive

B. could arrive

C. must have arrived

D. would have arrived

答案：

A. would arrive

B. could arrive

C. must have arrived

(答案→)D. would have arrived

解析：句意：这家人本可以准时到达，但是在半路上他们的汽车轮胎瘪了。根据句意：这家人本来可以准时，但是却没有，是对过去的虚拟，用would have done，must have done是对过去的肯定推测，表示“过去一定做了”，所以选D。