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A potent Greenhouse gas methane is formed in the environment from

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A potent Greenhouse gas methane is formed in the environment from  [#permalink]

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New post 07 Jul 2014, 15:36
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A potent green house gas, methane is formed in the environment from carbon dioxide and hydrogen , two major gases present in marshlands , are oxidized by bacteria

A) methane is formed in the environment from
B) methane is formed in the environment when
c) methane is formed in the environment and when
d) methane, formed in the environment from
e) methane, formed in the environment when
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Re: A potent Greenhouse gas methane is formed in the environment from  [#permalink]

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New post 22 Aug 2017, 06:01
A) methane is formed in the environment from
B) methane is formed in the environment when
c) methane is formed in the environment and when
d) methane, formed in the environment from
e) methane, formed in the environment when

Option B corrects the errors in the original sentence by using when.
The meaning becomes clearer as "x happens when y"
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Re: A potent Greenhouse gas methane is formed in the environment from   [#permalink] 22 Aug 2017, 06:01

A potent Greenhouse gas methane is formed in the environment from

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