A. | to keep | B. | keeps | C. | keeping |
分析 讓我們的家鄉(xiāng)保持清潔和美麗是我們的義務(wù).我們必須為它做些事情.
解答 答案:A 分析句子結(jié)構(gòu),這里考查的是it is+名詞+to do sth.結(jié)構(gòu).為了避免句子頭重腳輕,it位于開頭是作形式主語(yǔ),其真正的主語(yǔ)則是由后面的動(dòng)詞不定式充當(dāng)?shù)模畵?jù)此后面應(yīng)用keep的不定式to keep.故選A.
點(diǎn)評(píng) 本題考查動(dòng)詞不定式的用法.做題時(shí)注意分析句子結(jié)構(gòu),知道it is+名詞+to do sth結(jié)構(gòu)就不難做出答案.
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