Cell phones _ by more and more teens and many new functions _ to them nowadays

Cell phones _______ by more and more teens and many new functions _______ to them nowadays.

A. are using, have added B. is used, are adding

C. are being used, have been added D. being used, were added

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Cell phones _______ by more and more teens and many new functions _______ to them nowadays

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Cell phones _ by more and more teens and many new functions _ to them nowadays