Question

【题目】______ that Richard could not come, Doris would never have given the party.

A．If she knew B．Did she know

C．She had known D．Had she known

Answer 1

【答案】D

【解析】句意：假如Doris当初知道Richard不能回来，她就不会举办宴会。由后面的Doris would never have given the party可知，与过去事实相反，故前一句用过去完成时，故选D项。D项是把If省略，将had提前至句首，形成半倒装结构。