题目

 As we watched the panda, we stood still, ______ to one another. A. dared hardly to whisper            B. hardly daring to whisper          C. dared not to whisper              D. not dared whisper 答案：B如图，在△ABC中，D是边AC上的点，且AB＝AD,2AB＝BD，BC＝2BD，则sinC的值为________．