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感官动词 see, watch, observe, notice, look at, hear, listen to, smell, taste, feel + do 表示动作的完整性，真实性;
I saw him work in the garden yesterday.
I saw him working in the garden yesterday.(强调"我见他正干活"这个动作)
1)They knew her very well. They had seen her ___ up from childhood.
A. grow B. grew C. was growing D. to grow
因题意为，他们看着她长大，因此强调的是成长的过程，而非正在长的动作，因此用see sb do sth 的句型。
2)The missing boy was last seen ___ near the river.
A. playing B. to be playing C. play D. to play
答案A. 本题强调其动作，正在河边玩，应此用see sb. doing sth句型。