题目

 His sister left home in 1998, and ____ since. A.had not been heard of              B. has not been heard of   C. had not heard of                  D. has not heard of 答案：B如图，在△ABC中，AB=AC，D为BC中点，∠BAD=35°，则∠C的度数为（ ）A．35° B．45° C．55° D．60°