题目

The typewriter _______ all week.A. laying on the table, were it had laid B. lying on the table, were it had laidC. laying on the table, were it had laid D. lying on the table had been laid   答案：D  lying on the table现在分词短语作定语，该句是一个被动语态。  中心在原点，准线方程为x=±4，离心为12的椭圆方程是（　　）A．x24+y23=1B．x23+y24=1C．x24+y2=1D．x2+y24=1