主句是he's not willing to tell me ,me 和what it is ____is troubling him做tell的宾语.宾语从句应该是what is troubling him,强调what ,(it is what that is troubling him)把what 提前.不知道你懂没?
主句是he's not willing to tell me ,me 和what it is ____is troubling him做tell的宾语.宾语从句应该是what is troubling him,强调what ,(it is what that is troubling him)把what 提前.不知道你懂没?