Hong Zhanhui never gives up trying. It is the love and responsibility _______ has driven him to go through hardships and survive in life.

A．what

B．which

C．who

D．that

在Excel中，设A1单元格的内容为10，B2单元格的内容为20，在C2单元格中输入“B2-A1”、按回车键后，C2单元格的内容是（）。

A．10

B．-10

C．B2-A1

D．#######