Great efforts to increase grain production ____ if food shor

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Great efforts to increase grain production ____ if food shortage are to be avoided.
A.could be made B.must be made C.might be made D.would be made
为什么选B?这句话怎么翻译?

这是must make great efforts to increase grain production的被动语态.意思是“要想避免粮食短缺的问题,必须努力提高小麦产量”.
不明白的可以再问哟!

Great efforts to increase grain production ____ if food shor Great efforts to increase wheat production must be made if b Great efforts to increase agricultural production must be ma 1.Great efforts to increase agricultural production must be Greater efforts to increase agricultural production must be 1、Greater efforts to increase agricultural production must b 英语单选题,要原因Greater efforts to increase agricultural production In recent years,great efforts have been made to increase the 英译汉,Their efforts meant that steamships bringing grain to Eu Their efforts to improve the production have been very _____ To increase the production,they have introduced a new system increase efforts是什么意思