—Howisthesmogcontrolgoingoninourcapitalcity?   —Itooul...

问题详情：

 — How is the smog control going on in our capital city?

    —It oouldn't be worse. You        believe Beijing upgraded the smog alert from yellow to   orange and then red again yesterday.

n't     n't    ldn't     't

【回答】

D

知识点：虚拟语气与情态动词

题型：选择题