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Which of the sentences below contain a connective word that CANNOT BE omitted without a...

Which of the sentences below contain a connective word that CANNOT BE omitted without affecting syntax or meaning?


A

She is a volunteer that has been helping monitor birds”


B

“I never knew that that was near to where I live”


C

The song that you performed yesterday at the show is my favourite!


D

I believe that you owe me an apology.