Water plants provide food for many animals, and______also supply oxygen to the w

游客2025-02-04 23

问题 Water plants provide food for many animals, and______also supply oxygen to the water.

选项 A、what they
B、do they
C、they
D、they are

答案 C

解析 The pronoun they is the subject of the second clause.

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Waterplantsprovidefoodformanyanimals,and______alsosupplyoxygentothew