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改错!The suspect and some clues which they have discovered are

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改错!The suspect and some clues which they have discovered are very important to the detectives
He will never forget the day which he entered the college.两句有一处错误,可能偏向于语法错误,求正确回答
1 which——that
因为原句中的 they have discovered是一个定语从句,修饰先行词The suspect and some clues,
而当先行词既有人又有物时(比如此句的The suspect and some clues),就只能用that引导定语从句.
不能用which.
2.which——when
因为which引导定从时,which是作定从中的主语或宾语.
而在 he entered the college这个定语从句中,主语和宾语都有,
因此先行词the day在定语从句中只能作时间状语,
故用when引导定语从句.when=on the day