Some plants can take in carbon dioxidewe breathe out and give oxygen to us. A．in
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Some plants cantake in carbon dioxide（二氧化碳）we breathe out and give ________ oxygen tous.
A．in case
B．in turn
C．in return
D．inaddition
试题答案
答案：C
解析：| in case万一；in turn依次，轮流；inreturn作为报答；in addition另外。
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