_______ for your laziness，you could have finished the assignment by now.
A、HaditnotbeenA
句意：要不是你懒惰，到现在你就能完成任务了。本题是一个省略if的虚拟条件句，主句用couldhavedone表示与过去事实相反，条件从句应用haddone形式，had要提前构成倒装。
He would have given you more help, if he ________ so busy.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
We_____knowledge from our families,schools,jobs,and the mass media.
The furniture in her bedroom is quite different from ________ in the living room.
Itisdifficultto________theimplicationbetweenthelines.
