If -------,we will continue our experiment after office hours

来源：百度知道编辑：UC知道时间：2024/06/14 17:27:45

A it be necessary B necessary
C it being necessary D be necessary
选什么>高手详细解答!
C为什么是错的呢>?? 这能不能构成独立主格结构?

B.这是条件状语从句中常用的省略手法，为的是避免重复累赘，补全应为If it is ……

在某些状语从句中，当从句的主语与主句主语一致时或从句的主语是“it”时，可省去“主语+be部分”。如：
If (it is) necessary i'll explain to you again.
独立主格是：逻辑主语+分词（现在分词、过去分词），可以视为单独的句子。该句有if则要么是if的条件状语从句，要么是if的虚拟语气。

选B.
A.应改为it is necessary
C.动名词在这里不伦不类
D.少it
B.是简语，省略了it，很常见

We will not attact unless we are attacked if attacded 翻译句子：We could be healthy if we did. if we were in your shoes? ??if we were in your shoes?? if we had known 是谁的歌 if we can get to the futher... and if we're gonna cheat,... We don't know if he__.If he__,we'll tell you. “We can do anything we want to do if we stick to it long enough。”翻译 If only we could bottle the fresh air.翻译