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

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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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托福（TOEFL）

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

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