帮我做几道英语题,并解释一下,我会非常感激的!

题目

帮我做几道英语题,并解释一下,我会非常感激的!
1 I though her kind and helpful ____ I met her.
A for the first time B by the time C the first time D at a time when
2 kevin and Jane go back home to see her parents____.
A every other weeks B every second week C every a few weeks D every the second week
3 These wild flowers are so special I would do____ I can____ them.
A that,to save B whichever,save C which,to save D whatever,to save

答案

A
for the first time 相当于when用来引导时间状语从句.译为：当第一次...的时候.by the time常用于完成时.the first time做定语不引导从句.at a time when 的意思是:每当.时候
B
every +序数词+单数可数名词 译为：每第...
every + other +单数可数名词 译为：每隔...
every + few + 复数名词 译为：每隔几...
every +基数词+ 复数名词 译为：每...天
D
whatever 引导宾语从句.做 I would do whateverI can (do)第二个do的宾语.
to save 是不定式表示目的,做目的状语