——Why didn't you go to Tom's birthday party?
——Sorry, _________.
A:I wasn't invited
B:I didn't invited
C:I can't invite
D:I aren't invited
“这一发现使工业几乎彻底摆脱地方条件所规定的一切界限,并且使极遥远的水力的利用成为可能。”“这一发现”是指( )