29． The writer thinks that people in large cities should __________ ．A． stop the used water from getting into undergroundB． only use the water from the riversC． make their used water clean againD． use as much sea water as possible
29． The writer thinks that people in large cities should __________ ．
A． stop the used water from getting into underground
B． only use the water from the rivers
C． make their used water clean again
D． use as much sea water as possible
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