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Crown of the human tooth is the shiny outer surface of which is made of enamel.Shouldn't "of" next to "surface" be removed?Thanks a lot, experts!

Philip · Accepted Answer

The crown....(yes, 'of' should be removed).

Kjs980508 · Answer

Then, my book is wrong.... <img class='emoticon' style='Width:19px;Height:19px;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/6.gif' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/Emoticons/6.gif' alt='Emotion: sad'/> Thanks a lot!

Is this grammatically correct?

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