问题

It be the vocabulary that caused you the problem in the exercise because you know a lot of words.

A:may
B:couldn’t
C:should
D:needn’t

正确答案是：

同类题型

With so many things mixed up it’s hard to _______ what’swhat.

With the help of high technology, more and more new substances ______ in the past 10 years.

He’s been ________as judge in the State Supreme Court in California.[ ]

Something terrible _______him these days. Do you know what’s wrong

Used ______, the battery can last 72 hours.