Many measures _____________ to stop desertification and the areas likely to become desert are undeMany measures _____________ to stop desertification and the areas likely to become desert are under control.A.have been taken B.will be takenC.had been

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Manymeasures_____________tostopdesertificationandtheareaslikelytobecomedesertareundeManymeasures____

Many measures _____________ to stop desertification and the areas likely to become desert are undeMany measures _____________ to stop desertification and the areas likely to become desert are under control.A.have been taken B.will be takenC.had been
Many measures _____________ to stop desertification and the areas likely to become desert are unde
Many measures _____________ to stop desertification and the areas likely to become desert are
under control.
A.have been taken B.will be takenC.had been taken D.were taken

Many measures _____________ to stop desertification and the areas likely to become desert are undeMany measures _____________ to stop desertification and the areas likely to become desert are under control.A.have been taken B.will be takenC.had been
选A.
现在完成时表示对现在造成的影响和结果.
这个题,后面是结果,所以前面用现在完成时.