问题
选择题
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．could have arrived
答案
答案：D
选D 考查虚拟语气。句意：这一家人本可以按时到达的，不料半路上他们的轮胎漏气了。根据句意可知，此处表示对过去情况的虚拟，故谓语动词用could/would/should/might have done，故选D。