询问一到不知道是不是和虚拟语气有关的OG VERBLE分册的题目 相当困惑

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. A study commissioned by the Department of Agriculture showed that if calves exercise and associated with other calves, they will require less medication and gain weight quicker than do those raised in confinement.
(A) associated with other calves, they will require less medication and gain weight quicker than do
(B) associated with other calves, they require less medication and gain weight quicker than
(C) associate with other calves, they required less medication and will gain weight quicker than do
(D) associate with other calves, they have required less medication and will gain weight more quickly than do
(E) associate with other calves, they require less medication and gain weight more quickly than


答案是E   这属于虚拟语气吗?  还是不属于， E选项中的WILL难道是省略了吗？  然后我选的是A..  我想请问一下 V and （BE） VED能不能并列呢？

深圳的游子

A,B肯定一上来就排除了啊，and前后的时态都不一样的

E中的不是虚拟语气的，这个是If引导的条件句啊，可以是从句是一般现在是，主句是一般将来时，主句也可以是一般现在时的

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感谢回答 但是我还是很困惑 主句是一般将来时和一般现在时都可以随时互换 还是有限制什么时候用什么呢？