—What do you think people can do for their aged parents?—They do anything except to be wit

—What do you think people can do for their aged parents?
—They do anything except to be with them and be themselves.
A. don’t have to
B. oughtn’t to
C. mustn’t
D. can’t

(答案→)A. don’t have toB. oughtn’t toC. mustn’t D. can’t解析：don’t have to不必；oughtn’t to不该；mustn’t禁止；can’t不能。句意：你认为人们能为他们的老年父母做点什么？——除了陪伴他们，顺其自然意外，他们不需要做任何事情。结合语境可知选A。

谢谢回答！！！