A. must make B. should have made C. would make D. could have made 参考答案:D 答案解析:根据句意,可以肯定这里表示的是对过去的虚拟,因此要使用“could/would/should + have done"结构,所以[D]为正确答案。例如:No one could have foreto
第9题: [单项选择]妊娠期偏头痛可用以下哪种药物治疗() A. 舒马普坦口服 B. 佐米曲普坦口服 C. 哌替啶口服 D. 双氢麦角胺肌注 E. 麦角胺口服 参考答案:C