题目

I love my hometown  I have been living for nineteen years. A.whichB.that C.where D.when 答案：C 解析: where引导定语从句，并在从句中作状语。如图所示，OC是∠AOB平分线，OD平分∠AOC，且∠AOB=60°，则∠COD为A.15°B.30°C.45°D.20°