In the job interviews job applicants often find themselves asked unexpected questions, some very difficult ____.

A．to be answered

B．to answer

C．being answered

D．answering

采用修理尺寸法修理活塞环槽时应考虑槽脊强度，并要求（）。

A．保证平面间隙

B．保证搭口间隙

C．同一活塞上只有1道环槽按此法修理

D．按修理尺寸制造新环