高中英语单选 -How unhappy your roommate looks!-Yes,but he is not willing to tell me what it is _troubling him.空里为什么不能填which

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高中英语单选-Howunhappyyourroommatelooks!-Yes,butheisnotwillingtotellmewhatitis_troublinghim.空里为什么不能填which

高中英语单选 -How unhappy your roommate looks!-Yes,but he is not willing to tell me what it is _troubling him.空里为什么不能填which
高中英语单选 -How unhappy your roommate looks!-Yes,but he is not willing to tell me what it is _tr
oubling him.
空里为什么不能填which

高中英语单选 -How unhappy your roommate looks!-Yes,but he is not willing to tell me what it is _troubling him.空里为什么不能填which
如果要用which,得改成but he is not willing to tell me the problem which is troulbing him.
which 得跟在名词或一件事情、行为后面,如跟的problem在此句中作宾语,那which就是宾语补足语.
原句中what it is _troubling him 明显不符合.

是强调句型,It is....that....