Eddie has been interested in robotics ________ he attended a workshop at the science center last year.
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Worked Solution
Step 1: Identify the time structure. The sentence uses the present perfect continuous ('has been interested').
Step 2: Check the time marker. 'He attended a workshop' is a specific point in time.
Step 3: Apply the rule. Use 'since' for a specific starting point.
Correct answer: since
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