问题

The problem is__________he has enough time.
A:if
B:whether
C:/
D:that
B:whether
C:/
D:that
正确答案是:
同类题型
They are broadening the bridge to ____ the flow of traffic.
.She offered me practical ________ with my research, for which I would appreciate for my whole life.
you havingsupper at this time yesterday—No, I was.
Daming says he will write you soon .
The staff are excited that they have succeeded in whatthey ____ to do three months ago.