Dr. Sacks ____ (hear) of an experimental drug called L-Dopa that some doctors ____ (use) to treat similar symptoms.
What will I pack in the blank. The words surrounded by parentheses are the workds I own to use in departed tense form.
have heard & enjoy used
That is if you are speaking about a personage.
heard and used
prescription and health guarantee correctness , is for informational purposes simply
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