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1.who did the teacher______the exercise?

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1.who did the teacher______the exercise?
A.have done b.have do C.had done D.has done
2.The police were__________with a few minutes of my telephone call
A.at the spot B.on the spot C.in a spot D,by the spot
3.The two cheats ___________ the lights _______all night
A,let lighted B.had burning C,caused burn D.made lit
请说明为什么这么选
1.B
把这句话变为肯定句The teacher have who do the exercise.have sb do sth,让某人做某事.
2.A
at the spot是个固定搭配,在那个地方的意思
3.B
let sth/sb do,只能是动词原形;cause ab to do,后面接的是不定式;make sb do,后面接动词原形.had sth doing,让某人一直做某事,表示状态的持续.