1.He is good at English，_______ we all know.

　　A.that B.as C.whom D.what

　　2.The pen _______ he is writing is mine.

　　A.with which B.in which C.on which D.by which

　　3.Do you know the year _______ the Chinese Communist Party was founded?

　　A.which B.that C.when D.on which

　　4.The place _______ interested me most was the Children‘s Palace.

　　A.which B.where C.what D.in which

　　5._____ she was very tired，she went on working.

　　A.As B.Although C.Even D.In spite of

　　1.正确答案：B答案解析：as作关系代词可以单独用来引导非限制性定语从句。这时as所指代的不是主句中某个名词，而往往指代整个主句的含义。as在从句中可以作主语、宾语。从句可放在主句后，也可置于主句前。在本句中，as作宾语。

　　2.正确答案：A答案解析：with which是“介词+关系代词”结构，常用来引导定语从句。with有“用”的意思，介词之后只能用which，不能用that.with which在定语从句中作状语，即he is writing with a pen.

　　3.正确答案：C答案解析：when是关系副词，表示时间，在定语从句中作时间状语。

　　4.正确答案：A答案解析：which用作关系代词，在定语从句中作主语。

　　5.正确答案：B答案解析：although：虽然，尽管。符合句意。