we must get enough clean water.
【must=have to】但是must不能有時(shí)態(tài)變化的形式,但是都表示 必須,must有客觀上的義務(wù),have to 有主觀的不得不.
We have to get enough clean water.We ______get enough clean water.(用must改寫）
We have to get enough clean water.We ______get enough clean water.(用must改寫）
英語人氣：225 ℃時(shí)間：2019-10-08 04:58:23
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