worries me is we’re going to pay for all this.A. It thatB. That howC. What howD. As

问题补充：

worries me is we’re going to pay for all this.

A. It, that

B. That, how

C. What, how

D. As, that

答案：

A. It, that

B. That, how

(答案→)C. What, how

D. As, that

解析：what worries me 为主语从句，且 what 在主语从句中用作主语。