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

正确答案是：

同类题型

___ is that white bag —It’snine dollars.

n, let’s go for a drink.—Sorry. With so many problems _____ mymind, I can’t take a break.

Having an outdoor meal is always fun, but it can also be disappointing if ________.

at the forest was destroyed by a bigfire, a large ________of trees ______ to be planted on the mountain．

Can you watch TV on school nights——_______, I can’t. I can’t watch TV on Saturday,______.