Our teacher demanded that all of us English every dayA. should practise to speakB. would

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A. should practise to speak
B. would practise speaking
C. could practise speaking
(答案→)D. practise speaking
解析：考查词组和虚拟语气：句意：我们老师要求我们所有的人每天练习说英语。Practise doing练习做…，排除A，还有这句话的主句谓语是demand，从句的谓语应该是虚拟语气，用should do，should可以省略，选D。