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

worries me is we’re going to pay for all this.
A. It, that
B. That, how
C. What, how
D. As, that

A. It, thatB. That, how(答案→)C. What, howD. As, that解析：what worries me 为主语从句，且 what 在主语从句中用作主语。

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