题目内容

— Look, it _____ be Jack who is at the gate of the library.
It _____ be him. He has gone abroad.
may; must   B. must; mayn’t C. must; can’t    D. can; mayn’t
C
考查情态动词.may可以,must必须;一定,没有mayn’t这种说法,can’t不能;不可能.句意:看,在图书馆门口的一定是杰克._不可能是他.他已经去国外了.选C.最符合语境.
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