To read Tolstoy and to the nineteenth century Russian literature are two excelle

To read Tolstoy and ____ to the nineteenth century Russian literature are two excellent reasons for taking Professor Morrel’s course.

     A. to introduce         B. introduce

     C. being introduced   D. to be introduced

试题答案

D 

解析:

不定式和动名词均可用来作主语，但要注意它们的一致性。另外introduce是及物动词，这里要用被动式。