关于小儿各系统发育的一般规律，错误的是（）

A.神经系统发育最早

B.淋巴系统发育先快后慢

C.生殖系统发育较晚

D.肌肉组织到学龄期才加速发育

E.免疫系统生后即发育完善

Not until he promised to return it to me as soon as possible ____ my electronic dictionary to my classmate.

A．had I lent

B．did I lend

C．I had lent

D．I lent