ARE A FORM OF CARBON HAS BEEN KNOWN SINCE THE LATE EIGHTEENTH CENTURY
3. ...are a form of carbon has been known since the late eighteenth century.
A. Diamonds
B. Because diamonds C. That diamonds
D. Diamonds, which
3. ...are a form of carbon has been known since the late eighteenth century.
A. Diamonds
B. Because diamonds C. That diamonds
D. Diamonds, which