D．by which time

　　答案　C　[during which time是“在那段时间里”之意。by which time常用于完成时的句子中，所以排除D。]

　　26．I don't know the reason ________ you were absent from the meeting，but I am sure that someone will tell me the reason ________ you haven't told me.

　　A．why；that

　　B．that；why

　　C．because；which

　　D．of which；that

　　答案　A　[这两个the reason都充当着先行词，第一个定语从句缺原因状语，故用why；第二个定语从句缺宾语，故用that。]

　　27．Do you know the boy the dictionary ________ is very expensive?

　　A．whose

　　B．that

　　C．of whom

　　D．of which

　　答案　C　[先行词是the boy，the dictionary of whom＝whose dictionary。]

　　28．The villagers，________ had been damaged by the fire，were given help by the Red Cross.

　　A．all of their houses

　　B．all their houses

　　C．whose all houses

　　D．all of whose houses

　　答案　D　[此为定语从句，故排除A、B。C项应改为all whose houses才行。]

　　29．The time is not far away ________ modern communications will become widespread in China's vast countryside.A．as

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