几道英语题求助,有答案需要解释原因

几道英语题求助,有答案需要解释原因
(B)134. Mr Green returned to his office two hours earlier than______.
A．excepting B.excepted C. being excepted D. having excepted
这题为什么不选D
(C)143．The Olympic Games ,_______in 766 BC ,did not include women player until 1912.
A.first holding B.to be first held C.first held D.to be first playing
(B)144. The reading room is crowed with students ______ for the exam.
A.busily prepared B.busy preparing C.busily prepare D.are busily preparing
(C)145. ____ it before, Dick didn’t know how to begin.
A. for he hasn’t done B.having not done C.not having done D.he hasn’t done
(A)147. The missing boys were last seen ____ near the lake .
A.p;aying B.to be playing C.play D.to play
(A)148. To prevent the river _____, something will have to _____.
A.being polluted, be done B.to polluted, take C.from polluted ,be taken D.to be polluted , be done
(B)161. ______red , the little girl looked very lovely.
A.worn in B.wearing C.dressed D.dressing in
A.leads B.led C.leading D.which lead（这句话需要翻译下
）
(A)178. The prices of colour TV sets ____ down ,we’ll buy one.
A.coming B.came C.to come D.come