this is the question ______ that we've had so much discussio

this is the question ______ that we've had so much discussio This is the question we have had so much discussion about .这 24.This is the microscope ______ which we have had so much t this is the machine ()we have had so much trouble 18.this Is therefrigerator ______ we have had so much troubl "This is the very short story about ＿＿ we've talked so much. this is the washing machine / we have had so much trouble.a TESTNINE 18.this is the refrigerator we have had so much tro the question is so easy that we can answer it. This question is very (difficult),but that question is much This question is so ______ that you can work it out ______.A This is very novel about＿＿we've talked so much 填什么关系词?