问题

Some researchers believe that there is no doubt______a cure for AIDS will be found.[ ]

A: which
B: what
C: that
D: whether

正确答案是：

同类题型

you think it necessary that he____to Miami but to New York—-I agree , but the problem is _____hehas refused to.

Those who show respect for others will be respected ________

Modern plastics can _________ very high and very low temperatures.

The superman can burn things with his eyes.__ special his eyes are!

I’ m sorry that I have broken your glasses —– ____________!