1/如果要用be的话,应该用being sent,所以不选C
2/虚拟语气,从句用过去完成式,不能选D
3/选D是表示一种语气,即不应该持续目前砍伐森林的速度,选A的话,表现不出这种意愿（态度）
1.It was essential that theapplication forms ____________bac
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