Fill the blank spaces with the most appropriate of options A-E:

Radium .... Maria Sklodowska Curie.

  • A discovered
  • B is discovering
  • C has discovered
  • D was discovered by
  • E had been discovered by
jamb 1982english-language

The correct answer is D. was discovered by

The sentence is talking about who discovered radium in history. 

We use the passive voice "was discovered by" when attributing a past discovery/action to the person who did it.

 

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