There ______many restaurants in town, but they _________ eat the food there at first.

A．used to have, didn’t use to

B．used to have, didn’t used to

C．used to be, didn’t use to

D．used to be, didn’t used to

编写新闻邮件要注意的问题有（）。

A.言简意赅

B.保持规律

C.注重主题

D.突出广告