he knows the answer to是定语从句修饰a question的.有个短语the answer to the question.问题的答案,to 是介词,后面的宾语是定语从句引导词that, 省略了.
主句是It's not a question.
he knows the answer to是定语从句修饰a question的.有个短语the answer to the question.问题的答案,to 是介词,后面的宾语是定语从句引导词that, 省略了.
主句是It's not a question.