2. 外语
  3. Because (of the need) to maintain the correct balance of salts (and) minerals in the water, (keeping) saltwater fish in aquarium

Because (of the need) to maintain the correct balance of salts (and) minerals in the water, (keeping) saltwater fish in aquarium

admin2004-12-29  111
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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