Question

【题目】We must always keep our classroom _______ and tidy.

A. cleaningB. to cleanC. cleanedD. clean

Answer 1

【答案】D

【解析】

句意：我们必须一直保持我们的教室干净整洁。keep+宾语+形容词，保持……处于……状态。由tidy是形容词可知此处用形容词，cleaning是现在分词；to clean是不定式；cleaned是过去分词；clean，adj干净的；v 打扫。故答案为D。