题目

Easter Island, which was almost uninhabited when it was discovered on Easter Day in 1722 by a Dutch captain, is covered with hundreds of giant statues, each _______ several tons.   A. weighing           B. weighs          C. weighed          D. to weigh 答案：A　 I greatly appreciate ________ my son's life. [　　] A．you to saveB．your having saved C．you by savingD．you to have saved