Every possible means _____ to prevent the pollution,but the sky is still not clear.
Every possible means _____ to prevent the pollution,but the sky is still not clear.
A is used B are used C has been used D have been used
A,C 該如何判別?
A is used B are used C has been used D have been used
A,C 該如何判別?
英語人氣：149 ℃時(shí)間：2020-06-10 00:28:15
優(yōu)質(zhì)解答
根據(jù)后面說天空依舊不清澈,說明前句的動(dòng)作已經(jīng)發(fā)生了,用現(xiàn)在完成時(shí)的C
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