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

游客2024-01-05  17

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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