Mary  is  the  only one of the teachers who_____a little Chinese because she is one of my  friends who____been to China

A．knows have

B．knows have

C．know to

D．know has

人/手孔检查应包括（）

A、井盖检查

B、托架、托板检

C、井号油漆、描字

D、堵头检查