In1852 Robert Angus Smith published a detailed report of the chemistry of rain kin a large area around the city of Manchester, England
, noting that the closer one came to town, the more the city air would become increasingly acidic.
A.that the closer one came to town, the more the city air would become increasingly acidic
B.that the city air became increasingly acidic the closer one came to town
C.that coming closer to town, the city air became increasingly acidic
D.that the more the city air became increasingly acidic, the closer one was to town
E.the city air becoming increasingly acidic as one would come closer to town
这道题选A 但具体是什么意思呢？谢谢大家指导
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