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【题目】To observe the wild animals, the scientists hid behind the tree and ________ silent.

A. keepB. keepsC. keptD. was keeping

【答案】C

【解析】

句意“为了观察野生动物,科学家躲在树后面并且保持安静”。根据空前and可知,空处与动词hid保持一致,且为一般过去式,故选C

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