发生火情后要掌握（）的原则。

A、先救人、再报警、后救物

B、先报警，再救人、后救物

C、先救物、再救人、后报警

D、先报警、再救物、后救人

He is working hard, ______will make him pass the final exam.

A．that

B．which

C．for which

D．who