—What do you think we can do for our aged parents?—You do anything except to be with them

问题补充：

—What do you think we can do for our aged parents?

—You do anything except to be with them and be yourself.

A. oughtn’t to

B. don’t have to

C. mustn’t

D. can’t

答案：

A. oughtn’t to

(答案→)B. don’t have to

C. mustn’t

D. can’t

解析：句意：你认为我们能为我们年迈的父母作什么？除了陪伴他们你不必做任何事。don’t have to不必；oughtn’t to不应该；mustn’t禁止，不许；can’t不能。所以选B。