因为spend time (in)doing,time是先行词，spend和time之间不需要加介词，所以c是错的，别的选项就不用解释了吧
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第1个回答 2015-01-19
句子分解
Tom regretted having wasted so much time.
He should have spent 【the time】studying
显然第二句中the time为spent的宾语，为【物】，故定语从句用that
Tom regretted having wasted so much time.
He should have spent 【the time】studying
显然第二句中the time为spent的宾语，为【物】，故定语从句用that
第2个回答 2015-01-19
that 这里不是so...that句型，而是作为定语从句的先行词，指代time
第3个回答 2015-01-19
这是宾语从句吧，空格处用which或者that追答
所以选b
第4个回答 2015-01-19
后面“he should have spent studying”是定语从句修饰“time”，连接词用that
第5个回答 2015-01-19
that指代time追答
定语从句
有问题就问我尽可能回答你
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