Look!The man at the gate _____ be our headmaster .He is alwa
Look!The man at the gate _____ be our headmaster .He is always standing there every morning
No,it _____be him.He is holding a meeting in the office now.
A.must;can't
B.must;mustn't
C.can;can't
D.can;mustn't
选哪一个 为什么
No,it _____be him.He is holding a meeting in the office now.
A.must;can't
B.must;mustn't
C.can;can't
D.can;mustn't
选哪一个 为什么
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