问题

Jack could have avoided that terrible car accident, but he ________ careful enough

A:is not
B:was not
C:hasn’t been
D:hadn’t been

正确答案是：

同类题型

(2013山东济宁)The earthquake in Ya’an left________people homeless．

We are not ready to go into production yet.The new machine isn’t fully_____.

he does not know the answer.

Can I speak to Mr Wang ——Sorry， he’ s out. Can I _____ amessage

If you __ a fire, please break the glass to sound the fire alarm.