請看下面一道題：The chemistry teacher required the students _________ more attention _________ the lab clean.
A. to pay, to keep????????????? B. to paying, to keeping
C. to pay, to keeping?????????? D. paying, keeping

【分析】此題容易誤選A，認(rèn)為空白處應(yīng)填兩個不定式。其實正確答案是C，第一空填不定式，即套用 require sb to do sth (要求某人做某事)句型，而第二空則應(yīng)填 to keeping，因為 pay attention to(注意)中的to to 也是介詞，不是不定式符號，后接動詞時應(yīng)用動名詞，而不是動詞原形： devote one’s time to doing sth 把某人的時間用于(奉獻(xiàn)于)做某事be [get] used to doing sth習(xí)慣于做某事be [get] used to doing sthbe equal to doing sth 等于做某事，能勝任做某事What do you say to doing sth 你認(rèn)為做某事怎么樣be accustomed to doing sth 習(xí)慣于做某事look forward to doing sth 盼望做某事be opposed to doing sth 反對做某事object to doing sth反對做某事stick to doing sth 堅持做某事get down to doing sth 開始做某事take to doing sth 喜歡上做某事admit to doing 承認(rèn)做了某事pay attention to doing sth 注意做某事?

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