Preparations are being made for the Olympic Games ________ in Beijing in 2008．

Preparations are being made for the Olympic Games ________ in Beijing in 2008．

A.held

B.holding

C.to hold

D.to be held

答案及解析： D

解析：

不定式的被动表示将来，表示进行的被动，过去分词表示完成的被动。