问题补充:
The Olympics in London is expected to attract millions of visitors from home and abroad.
A. to hold
B. to be held
C. held
D. to be holding
答案:
A. to hold
(答案→)B. to be held
C. held
D. to be holding
解析: 考查非谓语动词。根据谓语动词is expected 被预测,可知The Olympics还没有举行,故用不定式的被动式表示将来,句意:在伦敦将要举行的奥运会被预测会吸引来自世界各地数百万游人。故选B。