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

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

admin2019-07-01  46
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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