函套分为（ ）两种。
A．书函、书套
B．四合套、六合套
C．书套、护封
D．辑封、腰封
参考答案：A
--- Isn’t that Ann’s husband over there ?
--- No, it _______ be him--- I’m sure he doesn’t wear glasses.
A．can’t
B． must not
C．won’t
D．may not
