Question

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

1. A.
   don’t have to
2. B.
   oughtn’t to
3. C.
   mustn’t
4. D.
   can’t

Answer 1

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表现好不必做其他任何事。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”。