—Did you arrive here this morning?—Yes it was at nine o’clock we came here.A. whenB. befo

问题补充：

—Did you arrive here this morning?

—Yes,it was at nine o’clock we came here.

A. when

B. before

C. which

D. that

答案：

A. when

B. before

C. which

(答案→)D. that

解析：考查强调句型。本句是强调句型，被强调部分是at nine o’clock。