— Look, it _____ be Jack who is at the gate of the library.It _____ be him. He has gone abroad...
—Look,it_____beJackwhoisatthegateofthelibrary.It_____behim.Hehasgoneabroad.may;mustB....
— 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
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