【題目】We must wear special boots to prevent us in the air.

A.floatB.to floatC.floatingD.floated

【答案】C

【解析】

句意:我們必須穿特制的靴子來阻止我們漂浮在空中。

float漂浮,動詞原形;to float動詞不定式;floating動名詞;floated是過去式或過去分詞形式。根據(jù)句意可知,這句話中使用了句型prevent sb. doing sth.“阻止某人做某事”,故這里應(yīng)用動名詞形式,選C。

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