我和楼上的答案,1,2不一样
1.B,此处并不是假设不是虚拟语气,而且虚拟语气的话,应该是省略should be而不是should,因为necessary,所以must be肯定不对,所以B
2.D,此处all 但是没有,因为all和that都不能省略,很容易排除A,B,关于C,all
that !=all what,
求教几道英语选择题1.It is necessary that the course in general scienc
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