方刀架和小滑板底板的结合面不平，接触不良，刀具压紧后会使（）手柄转动不灵活或转不动。

A、小滑板

B、中滑板

C、大滑板

D、以上均不对

—Do you know that Jack ______ a postman for about six years —Yes, I see.

A．has become

B．has turned

C．has changed

D．has been