问题补充:
— Do you believe there are aliens?
— I’m afraid not. I don’t think aliens in space.
A. can find
B. can found
C. can be found
D. can be founded
答案:
A. can find
B. can found
(答案→)C. can be found
D. can be founded
解析:本题考察的是特殊疑问句,其结构为主语+be done,,故选符合题意,故选答案为C