I regret ________ that you have failed the exam, but what you should do now is not to regret ______ so much time but to seize every moment from now on.

A．to inform; wasting

B．informing; to waste

C．to inform; to waste

D．informing; wasting

下列化肥中，从外观即可与其他化肥相区别的是[ ]

A、硝酸钾

B、碳酸铵

C、氯化钾

D、磷矿粉