题目

He asked a lot of questions, none of ______ was easy to answer. A. which              B. them       C. what               D. that 答案：A 如图△ABC中，BC=3，以BC为直径的⊙O交AC于点D，若D是AC中点，∠ABC=120°.（1）求∠ACB的大小；（2）求点A到直线BC的距离．