d. to be talking
happen to do something.
happen to be doing something
指恰好在做某事.这里用happened to be talking而不用happened to talk是因为强调当时他被石头打中的那一“时刻”我“正在”跟他讲话
d. to be talking
happen to do something.
happen to be doing something
指恰好在做某事.这里用happened to be talking而不用happened to talk是因为强调当时他被石头打中的那一“时刻”我“正在”跟他讲话