been there with me,I would have felt terrible at the ceremony. [ ]

A.If my friends not

B.Had my friends not

C.Have my friends not

D.If my friends didn't

皮亚杰划分儿童心理发展阶段的标准是（）。

A．生理发展

B．人格发展

C．主导发展

D．认知发展