问题补充:
The real secret to successful learning lies in students____an interest in what they are doing.
A. to take
B. taking
C. taken
D. having taken
答案:
A. to take
(答案→)B. taking
C. taken
D. having taken
解析:此处in是介词,后面接动名词作宾语,这里接的是动名词的复合结构,即名词(逻辑主语)+动名词。句意:成功学习的秘密在于学生对他们所做的事感兴趣。
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