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When Edison invented the light bulb, he tried over 2,000 experiments _______ he got it to work.
Question 1:
When Edison invented the light bulb, he tried over 2,000 experiments _______ he got it to work.
A.
as
B.
before
C.
when
D.
after
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Mixed Grammar Exercises - Test 7 | C1 – Advanced
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10 questions
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