So suddenly that the animals in the zoo looked very frightened during the total solar ecli

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

(答案→)A. did the sky turn darkB. the sky did turn darkC. turned the sky darkD. was the sky turned dark解析：考查倒装。so...that...引导的含结果状语从句的复合句中，如果so 放于句首，主句 部分需要采用部分倒装的形式。so suddenly 在本句中作状语，并放句首，故句子应采用部分 倒装形式。句意：在日全食期间，天黑得如此突然以至于动物园里的动物看上去都非常害怕。 故A正确。

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