Question

—Is Nancy knocking at the door?
—No, it ________ be Nancy. She has gone to Guangzhou.
A. can’t            B. mustn’t              C. won’t

Answer 1

A

考查情態(tài)動詞。根據(jù)語境：——是南希敲門么？——不，不可能是南希。她已經(jīng)去廣州了。故選A。