It was on January 12th a terrible earthquake struck the capital of HaiDi.A. whenB.

问题补充：

It was on January, 12th, a terrible earthquake struck the capital of HaiDi.

A. when

B. before

C. which

D. that

答案：

A. when

B. before

C. which

(答案→)D. that

解析：

试题分析：考查强调句，结构是：it is/was+强调部分+that/who…,强调的是时间on January, 12th, ，句意：就是在的一月12号一场可怕的地震袭击了海地的首都。选D。

考点：考查强调句型

点评: 强调句型：it is/was+被强调成分+that/who其它成分。强调句型最大的特点就是去掉it is/was…that/who…句子仍然成立。