问题

Growing population resulted in growing rubbish–There is possibility that rubbish ________the major threat to human beings

A:becomes
B:is becoming
C:became
D:would become

正确答案是：

同类题型

If you had worked hard, you ______ so anxious now．

you should go back to your plan,which is much more practical than the present one

I’ll never forget the day _______ I bought my ownguitar with my own money.

How about magic show– I should say it was success.

did you make contact with the travelagent, TomOh, that’s easy I surfed the Internet and thencalled one _____ the telephone number is provided