……… economically, one bottle will last for two months.

sb70012

Senior Member
Azerbaijani/Persian
……… economically, one bottle will last for two months.
a)Having used
b)When using
c)By using
d)Used (Answer Key)

Source: school exam

Hello,
Can options B or C work in the above test or not?

Thank you
 
  • RocketScience

    Senior Member
    English - England
    Sort of, you'd have to introduce the pronoun though.

    'When using it economically, one bottle will last...'
    'By using it economically, one bottle...'

    'Used...' is the only valid option as the sentence stands though.
     
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