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It is only with the help of scientific research _____ bring PM1 air pollution under control.
A.that we willB.we will
C.that we doD.do we
A

试题分析:考查强调句结构。强调句的结构为it + be + 强调部分 + that从句。此题强调状语only with the help of scientific research。句意:只有在科学研究的帮助,我们将PM1空气污染得到控制。故A正确。
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