billion people already live on our planet,and number is growing ___220,000every day.withB.in C.fromD.by

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billionpeoplealreadyliveonourplanet,andnumberisgrowing___220,000everyday.withB.inC.fromD.bybillionpe

billion people already live on our planet,and number is growing ___220,000every day.withB.in C.fromD.by
billion people already live on our planet,and number is growing ___220,000every day.
with
B.in
C.from
D.by

billion people already live on our planet,and number is growing ___220,000every day.withB.in C.fromD.by
D by
以多少多少在递增

growing by不是属于那种很规范的词组，只是by 这个单词的特殊性。很多时候都用by来表示数量的多少比如
My brother is taller than me by 3 feet.