问题描述：
百思不得其解
——Sorry,Mum.I've lost my pen again.
——I ____ it!You never remember to put your things away after using them.
A knew B know C.have known D.will know
答案选择了A.我选择了B.为什么?
——Sorry,Mum.I've lost my pen again.
——I ____ it!You never remember to put your things away after using them.
A knew B know C.have known D.will know
答案选择了A.我选择了B.为什么?
问题解答：
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