Directions: In a question given below an incomplete sentence that must be filled/ completed with one of the sentences/phrases given below i.e. one of the sentences/phrases can be fit into the given blanks. Choose the correct option and complete the given sentences.

NASA’s exploration of Mars ___________________ that may have existed, and relate it to finding evidence of ancient life.

1
have focused on finding traces and trails of water
2
has focused on finding traces and trails of water
3
has focused on find traces and trails of water
4
has focused on finding traces and trail of water
5
focused on finding traces and trails of water

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