C 非謂,不定式表目的
每個(gè)人都必須做他能做的事去組織廢水流入河流
can't
情態(tài)動詞表推測 mustn't是禁止做某事的意思,否定形式不能用于表推測
3.因?yàn)槭侨ツ臧l(fā)生的事,have stopped providing表示過去發(fā)生,已經(jīng)停止
如果你選Have to是想表達(dá)不得不把,但是由于是去年發(fā)生的事,最起碼得用had to...
everybody must do everything he can——waste water from running into rivers.
everybody must do everything he can——waste water from running into rivers.
A.keep B.kept C.to keep D.keeping（為什么）
2.It ____be him.
為什么是can't不是mustn't
3.since june 1st last year,all the supermarkets have___free plastic bags.
為什么是stopped providing而不是to stop providing
A.keep B.kept C.to keep D.keeping（為什么）
2.It ____be him.
為什么是can't不是mustn't
3.since june 1st last year,all the supermarkets have___free plastic bags.
為什么是stopped providing而不是to stop providing
英語人氣：734 ℃時(shí)間：2020-05-14 00:31:23
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