the school he saw his parents for him at the school gate.A. At reaching; waitedB. On a

问题补充：

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：

A. At reaching; waited

B. On arriving; waiting

C. At arriving; waited

(答案→)D. On reaching; waiting

解析：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。

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