——Do you know the answers to these questions asked by your little brother?——Of course not

问题补充：

——Do you know the answers to these questions asked by your little brother?

——Of course not, but I can’t let him know.

A. them

B. one

C. those

D. that

答案：

A. them

B. one

C. those

(答案→)D. that

解析：考查代词：句意：你知道你小弟弟问的问题的答案吗？--当然不知道了，但是我不能让他知道。这里用that指代上文，them“他们”，one泛指可数名词单数，those特指可数名词复数，选D。