问题
选择题
.
She ________the film. She knows nothing about it.
A．can’t see
B．can’t have seen
C．must see
D．mustn’t have seen
答案
答案：B
考查推测，用can, may must 肯定用must, 语气最强，may 语气较弱， can 用在否定句中。对过去推测用情态动词+have done
从She knows nothing about it可看出用否定的过去推测