Great efforts to increase wheat production must be made if bread shortages ___ avoided.选项是:A.will be B.can be C.are to be D.were to be 答案是什么,为什么选这个答案,

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Great efforts to increase wheat production must be made if bread shortages ___ avoided.选项是:A.will be B.can be C.are to be D.were to be 答案是什么,为什么选这个答案,

Great efforts to increase wheat production must be made if bread shortages ___ avoided.选项是:A.will be B.can be C.are to be D.were to be 答案是什么,为什么选这个答案,
Great efforts to increase wheat production must be made if bread shortages ___ avoided.
选项是:A.will be B.can be C.are to be D.were to be 答案是什么,为什么选这个答案,

Great efforts to increase wheat production must be made if bread shortages ___ avoided.选项是:A.will be B.can be C.are to be D.were to be 答案是什么,为什么选这个答案,
d,虚拟.如果要避免面包短缺,就一定要…

C

c
因为shortages是复数,所以要用表示复数的系动词are,此外这是表示将来的意味,这里所说的情况完全有可能发生,所以不用d的虚拟语气。