谁能解释解释为什么选a？（英语倒装

Answer 1

1.Be it ever so late, I must do another experiment.属于as, though 引导让步状语从句时Be谓语动词前置的倒装句。所以要选择A。
2.as, though 引导让步状语从句时谓语动词的倒装。
Try as he might, he didn't pass the exam.
尽管很用功, 但他考试还是不及格。
Search as they would here and there, they could find nothing in the room.
尽管到处寻找, 但他们在房间里找不到任何东西。
Be it ever so late.尽管很晚了，这一句省略though和may,再将be移至主语之前而来。Though...be... 即使……，(其实……未必……)：Though...is...意为“虽然……”
注意: 行为动词前置时, 从句主语后面要用 may, might, can,could, will, would 等情态动词, 若没有情态动词, 则需加上一个 do(does 或 did) 。 若前置的行为动词是及物动词, 则其宾语也随其后一并提前。
Change your mind as /though you do, you will get no help from us.
即使你改变主意, 你也得不到我们的帮助。
3.根据上述介绍，Be it ever so late, I must do another experiment.的原句是Though it (may) be ever so late ，I must do another experiment.意思是不管多么晚，我必须再做一次实验。这是一个表示让步意义的虚拟倒装句，Though it (may) be ever so late 省略了though和may，再将be移至主语之前，就变成了Be it ever so late.Though...be... 即使……，(其实……未必……)：Though...is...意为虽然……但是……

Answer 2

选择A。
动词原形作为虚拟语气现在时，是一种正式文体，有时可以置于主语之前，表示让步或条件的意义，如：
Magnets behave the same, be they large or small.
She will be sixteen year old, come May.
动词原形还可以表示愿望。如：
Long live France.
希望我能帮助你解疑释惑。