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Guptavandy Posted 15 years ago
Grammar

Comma use

Plesae check the use of comma in the following sentence:

The low recovery from this type of reservoir suggests that large quantities of oil remain in the reservoir and, therefore, depletion drive reservoirs are considered the best candidates for secondary recovery applications.
  

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The low recovery from this type of reservoir suggests that large quantities of oil remain in the reservoir , and therefore (,) depletion drive reservoirs are considered the best candidates for secondary recovery applications.

  • The low recovery from this type of reservoir suggests that large quantities of oil remain in the reservoir , and therefore (,) depletion drive reservoirs are considered the best candidates for secondary recovery applications.
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The low recovery from this type of reservoir suggests that large quantities of oil remain in the reservoir, and therefore(,) depletion drive reservoirs are considered the best candidates for secondary recovery applications.

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