In order to produce more grain, it________that the area of farmland_____A.is demanded, being increasedB.has been demanded, be increasedC.demand, should be increasedD.demands, should increase
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B解析本题考查时态及虚拟语气。根据语境可知，那个地区已经被要求，故用现在完成时的被动语态，demand + that从句，用should + V原形，根据语境用被动，选B。