下列各句加点的词语使用不正确的一项是

She ______ on a new novel ever since thissummer and it is supposed to ______ at the beginning of 2011

that people who read for pleasure have developed more imagination and good language skills than people who prefer to watch TV

－Look, your sister is playing the pianoover there. －She ______ be my sister. She has gone to America.A. mustn’t B.can’t C.shouldn’t D. may not

He is the only person who saw the accident ______. So he is the most important witness.[ ]