" Is "of" optional or necessary? He has been writing under the pen name (of) 'Joseph Roger'. He has to be writing under the pen name (of) 'Joseph Roger'.
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FalseName"He has be writing under the pen name 'Joseph Roger'." "He has be writing under the pen name of 'Joseph Roger'." Is "of" optional or necessary?He has been writing under the pen name (of) 'Joseph Roger'.