题目

Located in the heart of Beijing, the Imperial Palace, also known as the Forbidden City, is a place worth ________. A . to be visited B . being visited C . to visit D . visiting 答案：D如图所示的电路中，三个灯泡始终完好，当开关S闭合时（　　）A．L2、L3不亮，L1亮B．三灯都亮C． L2不亮，L1、L3亮D．三灯都不亮