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5 votes
A Japanese electronics company has invented a new type of rubber that generates electricity in

stretched.
А
NO CHANGE
B
when
:
over
:

User Remmy
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2 Answers

1 vote
(When), as he’s speaking from a time-line perspective (an incident that happened before in past tense)
User G Clark
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4 votes
I think the answer is When
User Aress Support
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