英语求教it's the reading-room!So you__eat lunch here.

问题描述:

英语求教it's the reading-room!So you__eat lunch here.
mustn't和 can't填哪个,为什么呢

can't比较好.意思是不要,而且也比较客气.mustn't意思是不准,似乎符合语境,但是语气太强硬