【題目】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“為了觀察野生動物,科學家躲在樹后面并且保持安靜”。根據(jù)空前and可知,空處與動詞hid保持一致,且為一般過去式,故選C。

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