【题目】If he____ to the teacher attentively, he____the answer to the problem now.
A.had listened, would have knownB.listened, would know
C.listened, would have knownD.had listened, would know
在线课程【答案】D
【解析】
考查虚拟语气。句意：如果他专心听了老师的话，他现在就会知道问题的答案了。结合句意，此处是if引导的虚拟语气，从句与过去的事实相反，主句与现在的事实相反，所以这里是混合虚拟语气。故选D。