-Have you found anything wrong with your computer? -Yes, and I was about to give it up when an idea __________ to me that it may be struck by some kind of virus.
---Is it good to look up every new word when I come across it in reading?
---No. You ______because you are likely to guess the meaning from the context.
A. can’tB. mustn’tC. don’t have to C. ought not to