China has promised to revise its existing regulations and __________ new policies according to WTO requirements.
A．formingB．to form
C．to be formingD．have formed
B。
之所以選不定式，是因?yàn)樗桥c前面的不定式to revise its existing regulations并列，一起用作動(dòng)詞promise的賓語(yǔ)。
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