问题

To turn off my cell phone before going to bed seems to be a rule . [ ]

A: to never break
B: never to have broken
C: never to be broken
D: never to be breaking

正确答案是：

同类题型

下列一组中全是元音字母的是 .

you heard about the recent election—Sure, it ________ the only thing on the news for the last three days.

It’s Mary’s own fault if she feels _____ at the party — she makes noeffort to be friendly to people．

I tried to apologize, but I think I ____ it the wrong way.

How often do you exercise –_______ .