问题

More and more people have come to realize that if wehad taken effective measures much earlier, the air quality ______ so seriouslynow.

A:is notpolluted
B:would not bepolluted
C:had not beenpolluted
D:would nothave been polluted

正确答案是：

同类题型

We finish our lessons 3:30pm.

What do you think about the measures taken to prevent _________ global warming— On __________ whole, they are good.

Nobody would stand out admitting the fact，for some reason，________ they lost the game.

Whydidn’tyou go to play football with us yesterday afternoon —I_____my mother with the housework then.

Look! Somebody has broken all the glass.— It’s not me. I _______ that.