相關Howisthesmogcontrolg的文學知識

問題詳情： —Howisthesmogcontrolgoingoninourcapitalcity?—Itcouldn’tbeworse.You________believeBeijingupgradedthesmogalertfromyellowtoorangeandthenredagainyesterday.A.won’t B.mustn’t C.needn’t D....