—  I telephoned him twice and I couldn't get through to him.

— I think that the line might have been out of order, _____ ?[ ]

A. don't you

B. wasn't it  

C. mightn't it    

D. hadn't it  

某个月里有三个星期日的日期为偶数，请推算出这个月的15日是星期[ ]

A．二    

B．三    

C．六    

D．日