6. Not far from the club there was a garden, ____ owner seated in it playing bridge with his children every afternoon.　 A. whose　　 B. its　　 C. which　　 D. that

解析:此题关键是理解seated这个单词，它是过去分词，而不是作谓语的过去式。它不能在句中谓语。所以后面句子不是一个非限制性定语从句，而是一个独立主格结构，故选代词its。

答案：B

5. The person we talked about ____ our school last week．

　 A．visiting　 B．will visit　　 C．visited　　 D．has visited

解析：此题中包含一个定语从句，the person既作先行词，又作句子的主语，要填入的应该是句子的谓语，根据后面的时间状语为last week，应选过去时。句中包含的定语从句we talked about中about虽为介词，但不影响主句的谓语，故应选C。

答案：C

拓展：观察下面三个句子：

□The person we spoke to ____ no answer at first．

　 A．making　 B．makes　 C．make　 D．made

此题中也包含一个定语从句we spoke to，the person既作先行词，又作句子的主语，要填入的应该是句子的谓语，根据句子的需要，应选过去时。本题中的to为陷阱，实际上它属于定语从句中，而不影响主句的谓语动词。故D正确。

□The person we referred to(提及)____ us a report tomorrow．

　 A．giving　 B．will give　 C．gave　 D．give

同上题一样，句中包含定语从句we referred to，所缺成份为句子的谓语，又根据句中的tomorrow，故用将来时。选B。

□The days we have been looking forward to ____ soon．

　 A．coming　 B．will come　 C．came　 D．have come

同理，此句中的定语从句包含短语look forward to，虽然to为介词，但并不影响主句的谓语动词，只是一个陷阱而矣。又根据句中的soon，应用将来时，故选B。

4. Before he went abroad，he spent as much time as he _____ English.

A. could learning　 B. learned　 C. to learn　 D. could　 to learn

解析：spend time (in) doing sth如果改为he did what he ______,则答案为could to learn.

答案：D

3. ______ is it _____ has made Peter _____ he is today?

A. What; that; that　 B. That; that; what　 C. What; what; that　 D. What; that; what

解析：用还原法则为It is what that has made Peter what he is today可知是强调句式。

答案:D

2. It would be a good idea to use a plastic bottle, ___cut off, as a container to grow young plants in.

A. of which the top　　 　B. the top is　　　 C. the top of which　　　 D. with its top

解析：此题是独立主格结构，如果题干改为____is cut off,答案则为A或C

答案：A.C

1. They ______ on the program for almost one week before I joined them, and now we _____on it as no good results have come out so far.

A. had been working; are still working　　 B. had worked; were still working

C. have been working; have worked　　　 D. have worked; are still working

解析：此题的时间参照点是before I joined them,，所以第一个空应该用过去完成进行时，第二个空根据时间now用现在进行时。

答案：A