从A、B、C、D四个选项中，选出与所给句子划线部分意义相同或相近并能代替的那一项。

— Terrible earthquakes happened in some parts of the world this year. 

— I'm sorry to hear that. [ ]

A. took place

B. took the place

C. broke down

D. put down

设有两个串p和q，求q在p中首次出现位置的运算称作______。

A．连接

B．模式匹配

C．求子串

D．求串长