问题

y possible means ______ to prevent the air pollution, but thesky is still not clear.

A:is used
B:are used
C:has been used
D:have been used

正确答案是：

同类题型

Ministryof Healthy has looked into the case________15 people have confirmedHCVin Yicheng hospital in Anqing

Tom and Peter __________ good friends.

Good food along with beautiful shoes ______the poor little girl hopes for.

(2013·山东淄博二模)Maria ________ the interviewers with her knowledge and experience, and as a result she was offered the job

下列词语中，没有错别字的一组是