问题

For some time the expert __________ people of the health risks caused by passive smokingHe says he won’t stop until all the smokers around him decide to quit smoking

A:is warned
B:is warning
C:has been warning
D:has been warned

正确答案是：

同类题型

The population of the world ____ still ____ now.

You did not perform as well as the other competitors— ,you failed.

下列各组诗句所反映的传统节日与其它三句不同的一项是

sunlight ,all living things would die.

She will tell us why she feels so stronglythat each of us has a role _____ in making the earth a better place to live.