问题

I ___________ frustrated when I wasn’t sure of the correct answer.[ ]

A: may be
B: used to
C: used to be
D: use to be

正确答案是：

标签： frustrated , used

同类题型

I_______ my homework when the door bell__________.

____doyouwear?—SizeXL.[ ]

Is that _________ sister, Dave? — No, it isn’t. She is my friend.

I’m afraid you ________play basketball here.— I’m sorry I won’t.

He often English with the classmates.