May follow by a preposition pharses?

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"As these drugs must be asked for at the pharmacy dispensary, the pharmacist may at his discretion want to counsel the buyer". this sentense is in a handout of PTEC program at Selkirk college.

 

"at his discretion " is a preposition pharses, but it  is precededed by May ,  I would like to know this is correct according to grammer roles.

 

Thanks

edited Oct 06 '11 at 06:04 JunweiZheng New member

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