问题

They _____ for sixteen hours and still have a long way to go
A:had walked
B:have been walking
C:walked
D:had been walking
B:have been walking
C:walked
D:had been walking
正确答案是:
同类题型
My family and I will go back to the USA tomorrow.— ____________
Where is Tom ?—Well , he you here Otherwise he would come down right now
Every morning, he listens to English news_________ theradio.
We regret to inform you that there are no tickets ______ for Friday’s performance.
– Please tell me how to work out thismaths problem.— Use your ______ , then your find a way.