If you want to correct your composition, you’d better be more careful        I have crossed out paragraphs for you.

A．that

B．when

C．what

D．where

解除超程报警的第二步是按下“超程释放按钮”，同时按下“（）按钮”，当NC准备以后，继续按着“超程释放按钮”。

A.钥匙

B.报警

C.启动

D.准备