Not until _______ home _______ her appointment with the doctor.

A．she arrived; did she remember

B．did she arrive; that she remember

C．she arrived; when she remembered

D．did she arrive; had she remembered

双务合同与单务合同是以()为标准进行划分的。

A.合同当事人双方权利义务的分担方式

B.法律上是否规定一定的名称

C.是否以交付标的物为成立要件

D.合同的成立是否需要特定的形式