问题
选择题
_______ the school, he saw his parents ________ for him at the school gate.
A．At reaching; waited
B．On arriving; waiting
C．At arriving; waited
D．On reaching; waiting
答案
答案：D
题目分析：考察介词用法以及固定结构。介词on一…就…；后面要使用动名词doing形式。第二空考察了see sb doing sth看见某人正在做某事。句义：一到学校，他就看见父母亲在校门口等着他。故D正确。