题干
I have a lot of interesting topics to discuss with you. Will you come to me after school ______?
A：when you are very convenient
B：when it is convenient to you
C：in the convenience of you
D：when it is convenient by you
答案(点此获取答案解析）
B
双链在复制时解旋，这时下列哪一对碱基从氢键连接处分开