题目

“人间四月芳菲尽，山寺桃花始盛开。”造成这种奇观的生态因素是（   ） A．土壤                   B．水分                    C．光照                   D．温度 答案：D3．If Peter hadn't offered me a ride home yesterday，I _____ a taxi．（　　）A．should callB．would callC．would have calledD．should have called