I think that's unlikely to happen, but if that, both America's and China's interest w

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(答案→)A. should occur
B. occurs
C. had occurred
D. is going to occur
解析：考查虚拟语气：句意：我想这不可能发生，如果发生了，中国和美国的利益会被严重的损坏。第一句话就说这不可能发生，所以如果发生，是对将来的虚拟条件句，从句用should do或were to do，也可以用过去时，选A。