— 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
考查情態(tài)動詞.may可以,must必須;一定,沒有mayn’t這種說法,can’t不能;不可能.句意:看,在圖書館門口的一定是杰克._不可能是他.他已經去國外了.選C.最符合語境.
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