——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
网友回答
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。