I ________ to help you with your homework, but I couldn’t spare any time. I ________ a composition last night and I’ll finish it today.

A．wanted; wrote

B．had wanted; was writing

C．have wanted; wrote

D．wanted; have been writing

______是在20世纪初由亨利发明，它基本上是一种______，横轴表示______，纵轴表示______，______表示在整个期间上计划的和实际的活动完成情况。其直观地表明任务计划在什么时候进行，以及实际进展与计划要求的对比

A．地点

B．时间

C．要安排的活动

D．资金