问题

Don’ t worry. A number of efforts are being made ______ the whole system operating normally.

A:being kept
B:kept
C:keeping
D:to keep;

正确答案是：

同类题型

I’m told that www．languagepractising．com is a free website ____ learners can not just learn various languages but also chat online．

I want to leave now; I can’t ____nothing useful here.

5The climate here doesn’t agree _____ her

I prefer ____ to ____.

Let’s play baseball.—_______ .