分类：教育/科学-升学入学-高考
问题：定语从句的问题当先行词是that,those时，引导词是否必须用 
当先行词是that ,the时，引导词是否必须用which　　例：All of the flowers now raised by her have developed from those ____ in the forest.    A. once they   B. they grew once    C. that once grew   D. once grew　应该是哪个答案正确呢，还是没有正确答案
回答：选C 
现在定语从句对which和that的使用要求并不像中国的有些语法书上要求的那么严格。这里是一个定语从句，而定语从句中又缺少主语，只有用that做主语来引导这个定语从句了。