Question

英语B级的几道题求详解，我比较笨。。

1. It·s necessary that you____in the classroom before 8:00 tomorrow morning.
A.are B.be C.will be D.must be

2————，we could ask him about it.
A.Were he to come tomorrow B.He were to come tomorrow
C.He would come tomorrow D.Would he to come tomorrow
3.___it began to rain.
A.No sooner wo started out when B.Hardly had we started out that
C.Scarcely had we started out that D.Rarely had we started out when
4.The traveler_____I went to the West comes from south Europe.
A.with who B.with whom C.who D.with which

答案是 B A D B 不知道为什么，求详解，谢谢

Answer 1

1 it is necessary that... 特殊句型，that 后面用动词原形.
2 if 的虚拟形式，原句是 if he were to come tomorrow, we could...
从if从句的tomorrow，我们可以看出是对未来的假设，所以用were to的形式，
答案A 把were 前置，省略了if， 也可以。
3 固定搭配，hardly/rarely/scarcely...when...意思是一。。。就。。。
如果把hardly/rarely/scarcely提前，需要把助动词也提前，这里是had，所以答案是D
4 句子主干事 the travler comes from south europe, 什么tralver呢？ with whom i went to the west 就是那个和我一起去西方的旅行者，这里需要一个with，根据句意，因为with是介词，所以后面要加whom（做宾语）

Answer 2

1.应该 用should be ，should 省略了。
2.首先该句是个问句，可排除BC，而would 后应接would do sth，至于be to do sth 则表示将做某事，计划做某事。
3.否定词放在句首，全句部分倒装（be或have动词前提）。而when 引导时间状语从句，不能用that代替。
4.这里显然是个限制性定语从句，因为主语是人，不能用which，所以D排除，而with 后该接人称代词宾格。