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：

同类题型

Tom, it seems that you haven’tcleaned your bedroom the whole week .—You didn’t come in around 10 yesterdaymorning; I ________ it .

The funny story made the kids _________.

The ______ among the world’s scientists is that the world is likely to warm up over the next few decades.

ring her study in MassachusettsInstitute of Technology she has got the degree _____ PhD, and it is a degree______ chemistry.

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