------two college students who rescued the boy A they are B they were C It is D It was

------two college students who rescued the boy A they are B they were C It is D It was
------two college students who rescued the boy A they are B they were C It is D It was

------two college students who rescued the boy A they are B they were C It is D It was
D It was
这是it was .that（who）强调句,因为强调是人,所以用who.