Mashaal Masha
Dr. Rocio Paola Caballero-Gill is a paleoceanographer. This means that Dr. Caballero-Gill doesn't just study oceans as they are today. She uses chemistry and fossil evidence ________ oceans as they were in the past.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A: 

has studied

B: 

to study

C: 

studied

D: 

studies

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