theybecomedirty,thelakesarenot

________ they become dirty, the lakes are not able to clean themselves

A．Once

B．Since

C．As

D．Because

登录免费查看答案和解析

相关试题

He was afraid that the branch might bend over and break, and he would be sent _____ to the ground.

A．crashing

B．throwing

C．rushing

D．dropping

收藏答案/解析

Do you think a wife should _____ her habits and tastes to those of her husband?

A．comply

B．confirm

C．consent

D．conform

收藏答案/解析

They always kept on good _____ with their next-door neighbors for the children's sake.

A．friendship

B．relations

C．intentions

D．terms

收藏答案/解析

-----Who is responsible for sending out misinformation?
----Most of the fault lies _____ the administration.

A．in

B．to

C．on

D．with

收藏答案/解析

The town’s drinking-water _____ with prim chemicals at present.

A．contaminates	B．is contaminated
C．is being contaminated	D．has been contaminated

收藏答案/解析