2."介词＋which/whom"引导的定语从句

　　"介词＋关系代词"引导的定语从句中，关系代词只能用which或whom。修饰物时用which，修饰人时用whom。在这个结构中，介词的确定原则是：

　　(1)依据定语从句中动词或形容词等所需要的某种习惯搭配来确定。

　　Yesterday we visited the West Lake for which Hangzhou is famous.

　　昨天我们参观了西湖，杭州因其而出名。

　　(2)依据与先行词搭配的具体意义而定。

　　I'll never forget the time during which I spent my childhood in the country.

　　我永远不会忘记我在乡村度过的童年时光。

　　(3)根据所表达的意思来确定。

　　The colorless gas without which we cannot live is called oxygen.

　　这种无色的、离了它我们就无法生存的气体是氧气。

　　(4)表示"所有"关系或"整体中的一部分"时，通常用介词of。

　　The old woman has two sons，both of whom are doctors.这位老太太有两个儿子，他们都是医生。

　　注意：(1)有些"动词＋介词"短语如look for，look after，call on等，如果介词提前将会失去动词短语的意义，所以不可把介词置于关系代词前。

　　Is this the book which she is looking for?

　　这就是她在找的那本书吗？

　　The babies whom the nurses are looking after are healthy.

　　护士们照看的婴儿都很健康。

　　(2)"介词＋which/whom"既可引导限制性定语从句，也可引导非限制性定语从句。

　　That was the way in which she looked after us.

　　那就是她照料我们的方式。

　　He has two daughters，one of whom works as a nurse.他有两个女儿，其中一个是护士。

单句语法填空

1.The ring was spread over the garden，where it remained until the carrot's leafy top accidentally sprouted(生长) through it.(2017·浙江)

2.But my connection with pandas goes back to my days on a TV show in the mid-1980s，when I was the first Western TV reporter permitted to film a special unit caring for pandas.(2016·全国Ⅰ)