問題詳情：
![—Howisthesmogcontrolgoingoninourcapitalcity?—Itcouldn’...]( "—Howisthesmogcontrolgoingoninourcapitalcity?—Itcouldn’...")
— How is the smog control going on in our capital city?
— It couldn’t be worse. You ________ believe Beijing upgraded the smog alert from yellow to orange and then red again yesterday.
A. won’t B. mustn’t C. needn’t D. shouldn’t
【回答】
A
知識點：情態動詞
題型：選擇題
