The location-based game for smartphones "Pokemon Go" ____ by Niantic and became popular...

Question

The location-based game for smartphones "Pokemon Go" ____ by Niantic and became popular all over the world
a)developed
b)was developed
c)had developed
d)was developing

Answer 1

D) Was developed
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Comments

или б там не понятно

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b)was developed/ d)was developing

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а блин

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бббббб

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сорри

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спасибо <3

Answer 2

D................................