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

A. cleaningB. to cleanC. cleanedD. clean

【答案】D

【解析】

句意：我們必須一直保持我們的教室干凈整潔。keep+賓語+形容詞，保持……處于……狀態(tài)。由tidy是形容詞可知此處用形容詞，cleaning是現(xiàn)在分詞；to clean是不定式；cleaned是過去分詞；clean，adj干凈的；v 打掃。故答案為D。

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