-Did you arrive here this morning? -Yes. It was at nine o'clock we came here. A．

—Did you arrive here this morning?

—Yes. It was at nine o'clock ________ we came here.

A．when B．before

C．which D．that

试题答案

D

考查强调句型。此句中强调的是时间状语“at nine o'clock”，如果选when，就要去掉“at”。