So suddenly that the animals in the zoo looked very frightened during the total solar eclipse.
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
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So suddenly that the animals in the zoo looked very frightened during the total solar eclipse.
| A．did the sky turn dark | B．the sky did turn dark |
| C．turned the sky dark | D．was the sky turned dark |
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