【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(guān)察野生動(dòng)物，科學(xué)家躲在樹(shù)后面并且保持安靜”。根據(jù)空前and可知，空處與動(dòng)詞hid保持一致，且為一般過(guò)去式，故選C。

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