why did not you catch the bus ____i told you to.
问题描述：
why did not you catch the bus ____i told you to.
a while b as c since d although
判断选择的原因.while as since although 的 区别.
one tree after another went down cut down by the water ,which ___3 meters deep.
a must have down b can be c can have down
判断选择的原因.
答
1. 答案：B.
翻译：为什么你没有按照我告诉你做的那样赶上那辆班车呢?
解释：while作为连词的意思是“当...时候/只要/尽管,虽然/但是,然而/趁着”；since作为连词的意思是“自从...以来/既然”；although做连词的意思是“尽管,虽然”.
只有as有“按照...”之意,在此题中引导一个方式状语从句.
2. 答案：B.（如果楼主没有打错字的话）
翻译：一棵接一棵的树被水冲倒冲走了,水可能深达3米.
解释：AC用must/can have down是不可能与3 meters deep连用的.
而如果A是must have been（一定...）,而C是can have been（可能...）的话,则答案应该选C,因为对过去所发生的动作进行推测,用完成式比一般式更好.