新概念英語定語從句I want to buy the books .they are on the counter.改寫

題目：

新概念英語定語從句
I want to buy the books .they are on the counter.改寫爲定於從句）
I want to buy the .on the counter.
this is a photograph...I took during my trip to london
this is the best film .Ihave ever seen

解答：

I want to buy the books *which(或that）are* on the counter.
This is a photograph *which(或that)--可省* I took during my trip to london.
This is the best film *which(或that)--可省* I have ever seen.