A terrible terrorist attack      at the train station in Kunming, on March 1, 2014      29 death and more than 140 injuries.

A．occurred; caused

B．happened; caused

C．occurred; causing

D．happened; to cause

灌浆施工中应进行( )，以保证灌浆施工质量。

A．压水试验检查

B．测试孔检查

C．压力灌浆封孔检查

D．灌浆孔、检查孔的封孔质量检查

E．总孔数检查