关于卵泡的结构，哪项是不恰当的（）

A.结缔组织分化形成卵泡膜

B.生长卵泡时期有颗粒层和卵丘形成

C.由卵母细胞和颗粒细胞构成基本结构

D.卵泡腔形成发生在次级卵泡阶段

E.透明带出现在原始卵泡

Mr. White _________ at 8:30 for the meeting, but he didn’t show up.

A．should have arrived

B．should arrive

C．shouldn’t have had arrived

D．shouldn’t be arriving