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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.
admin
2019-07-01
42
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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