问题

Every possible means ________ to prevent the air pollution，but the sky is still not very clear

A:where
B:how
C:when
D:what

正确答案是：

同类题型

We are all ______ about the ______ movie.

.．—Dad，I’m worrying about my road test！—Cheer up，dear! There___________be any difficulty about passing it since you have practised alot in the driving school．

Bach died in 1750，but it was not until the early 19th century ________his musical gift was fully recognized.

With my money _____ , I went back home.[ ]

Can I have a film ticket—Oh, sorry. There are none left. We .