来自冷东起的问题
【whenyouhaveproblems_____(do)yourhomework,youcanasktheteacheraboutthem.】
whenyouhaveproblems_____(do)yourhomework,youcanasktheteacheraboutthem.


【whenyouhaveproblems_____(do)yourhomework,youcanasktheteacheraboutthem.】
whenyouhaveproblems_____(do)yourhomework,youcanasktheteacheraboutthem.
doing
haveproblemdoingsth
做某事遇到问题