单选题
The directors that participated in the meeting were required to contribute ______. suggestions to their colleagues. A. theirs B. their C. them D. themselves
【正确答案】
B
【答案解析】初级问题 本题空格在名词的前面，4个选项中只有所有格可以填入。所有格的作用相当于形容词， 可以用在名词前面，但不能用在代词前面，否则就重复了。 [高频词语] participate in 参与某事 be required to do 被要求做某事 contribute A to B为B贡献A