—What do you think we can do for our aged parents?
—You __ ___ do anything except to be with them and be yourself.
A. don’t have to B. oughtn’t to C. mustn’t D. can’t
A don’t have to意为“不必”。根据所提供的情景except to be with them and be yourself可判断出除了和他们在一起不必做其他任何事。oughtn’t to 意为“不应该”;mustn’t 意为“不准,禁止”;can’t 意为“不能够,不可能”。