问题

The air pollution is terrible.— It will be worse ________ we take action to protect the environment.

A:if
B:unless
C:until
D:when;

正确答案是：

同类题型

______ they live in the same house, we would no trouble finding them.—But as traveling salesmen as well as seasonal herdsmen and farmhands, as you know, they move house _______ many of the Americans who live on wheels

I hope you goodresults in the exam.

Most of the representatives raised a question at yesterday’smeeting, needsurgently.

This song reminds me ______an experience I once had in the countryside.

I’d rather ________ see the film on such a rainy day