17.My brother had become a doctor,______ was what he wanted

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17.My brother had become a doctor,______ was what he wanted to be.A.who B.what C.that D.which
为什么不能选that,解释一下什么是非限制性定语从句

Which .定语从句有限制性和非限制性两种,限制性定语从句是先行词不可缺少的部分,去掉它主句意思往往不明确 ,限制性定语从句一般紧接在先行词的的后面.例如 The boys who were free would came along and made fun of him .有空的男孩子会来取笑他.
而非限制性的定语人名是先行词的附加说胆,去掉了也不会影响主句的意思,它与主句之前通常用逗号分开.
This novel ,which I have read three times ,is very touching 我本小说很动人,我已经读了三遍.
非限制性定语从句还能将整个句子做为先行词.Liquid water changes to vapor ,whic is called evaporation .液态水变为蒸汽,这就叫做蒸发.

17.My brother had become a doctor,______ was what he wanted His sister has become a doctor,______ is what he wants to be 用恰当的关系代词或关系副词填空：1.My brother has become a doctor,___was what 同义句转换.My brother became a doctor when he was 24. He wanted to become a singer but he became a doctor ____ . He wanted to become a singer but f_,she became a doctor. The last time we had a family reunion was ______ my brother' What( )your brother( )? 答：He is a doctor. He became a country doctor,as he had always wanted.as...后面的句 His son has become a doctor,______he wanted to be . 一道英语选择题What he ___ is to become a doctor.a. is dream ofb. dr My brother wanted to have a ne