B.If I don't have your help
C.If it hadn't been for your help
D.If it didn't for your help
答案:①D 由主句时态可知此处为与过去事实相反的虚拟语气,所以条件句中谓语动词用过去完成时,虚拟条件句中若要省略if,则要把助动词were,should或had提到句首。故选项D正确。
②C 由主句时态可知此处为与过去事实相反的虚拟语气,故if从句应用过去完成时态,只有C项符合要求。
知 能 层 层 练
一、单项填空
1.I, as a green worker, should ________ the experienced about the matters that I am not familiar with.
A.consult B.discuss
C.talk
D.recommend
答案:A
解析:consult意为“咨询;请教”,consult sb. about sth.“向某人请教/咨询某事”,符合题意。
2.On account of the development of the economy, the environment is seriously polluted and we must ________ the emission of the carbon dioxide.
A.cut in
B.cut off
C.cut up
D.cut down
答案:D
解析:cut down“减少;削减”,相当于reduce。
3.In cultivating our students, we should ________ the teaching with the recreation.
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