I had wanted to help you last night but I couldn't spare any time, for I＿＿＿a composition which I have to hand in this morning.

A．wrote

B．was writing

C．had written

D．have written

下列关于轻度精神发育迟滞的叙述正确的是（）

A.智商在70～75之间

B.成年以后可达到6～9岁的心理年龄

C.就读小学后学习困难，最终勉强完成小学的学业

D.日常生活需人照料，无社会行为的能力

E.不认识亲人及周围环境