2. 职称英语
  3. Because (of the need) to maintain the correct balance of salts (and) minerals in

Because (of the need) to maintain the correct balance of salts (and) minerals in

游客2025-02-09  3
问题 Because (of the need) to maintain the correct balance of salts (and) minerals in the water, (keeping) saltwater fish in aquariums requires more work (that) keeping freshwater fish.
选项 A、of the need
B、and
C、keeping
D、that
答案 D
解析
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