开发商的主要合同关系通常包括( )等。

A．保险合同

B．分包合同

C．销售合同

D．加工合同

E．勘察设计合同

He speaks English _____ an American, so we all think he stays in America for many years. [ ]

A. as good as

B. worse than

C. as badly as

D. as well as