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
网友回答
A. to introduce
B. introduce
C. being introduced
D. to be introduced
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。