问题

I ___________ frustrated when I wasn’t sure of thecorrect answer.
A: may be
B:used to
C:used to be
D:use to be
B:used to
C:used to be
D:use to be
正确答案是:
同类题型
They put forward a lot of plans at the meeting, none of ______ carried out in their work.
.In the country area about one in ten______ have enough to eat.
Ihad been working on math for the whole aftensoon and the numbers before myeyes[ ]
It often happens that people with good eyesight fail to seeis right in front of them.
Would you like ____ to drink— Yes, I’d like a cup of coffee.