Question

Every necessary means____ to protect milu deer which____ very valuable to us. As a result, the number of milu deer is increasing

1. A.
   are used; is
2. B.
   is being used; is
3. C.
   have been used; are
4. D.
   has been used; are

Answer 1

D
第一空考查主谓一致。means 方式，方法，单复数同形，主语是Every necessary means 每一种方法，谓语动词应用单数，deer也是单复数同形，在这里指复数所以谓语动词用复数。句意：每一种必要的方法已经被使用了来保护对我们来说非常有价值的麋鹿。结果，麋鹿的数量在增加。所以选D。