几道高2选择题（急，解释一下答案为什么，只要你回答得可以我马上采纳你的）

1.Every means___out but never with success, as far as my knowledge goes.
A.is tried B.has been tried C.are trying D.have been tried

选D, means复数，用have,过去完成时语态，所以用完成时。

2.We go home to see our parents___.
A.every four week B.every four weeks C.each four week D.each four

选B, every后面接单复数都可以，each必须接单数，

3.This apple tree is___the orange tree.
A.two times higher than B.two times as higher as C.two times heighest as D.two times high as

选A, 比较级规定写法，B as...as 中间必须是普通级。

4.___to read this book,I found every page worthwhile.
A.However it was difficult B.However difficult it was C.No matter hoe it was difficult D.No matter hoe difficult was it

选A, it was difficult to read为完整形式，howvever无论怎样，通常当一单独句子理解，后面跟完整句子。

1、B
在我能力范围内的每种方法都试过了，但没能成功。
every用单数，means不是mean的复数，是一个单词，意思：方法，途径
被试过了，是被动，是完成。所以··B
2、B
固定搭配，每四周去看父母。在句中充当状语。each那个短语是名词性的，不能充当状语，例子：each student···