摘要：29．-How unhappy your roommate looks! -Yes, but he's not willing to tell me what it is is troubling him. A. what B. which C. as D. that
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---How unhappy your roommate looks!
---Yes, but he's not willing to tell me what it is _______ is troubling him.
- A.what
- B.which
- C.as
- D.that
---How unhappy your roommate looks!
---Yes, but he's not willing to tell me what it is _______ is troubling him.
- A.what
- B.which
- C.as
- D.that
—How unhappy your roommate looks!
—Yes, but he's not willing to tell me what it is _______ is troubling him.
- A.what
- B.which
- C.as
- D.that