Many people the opening ceremony of World Expo which was so amazing.A. witnessedB.

问题补充：

Many people the opening ceremony of World Expo, which was so amazing.

A. witnessed

B. participated

C. swallowed

D. handled

答案：

(答案→)A. witnessed

B. participated

C. swallowed

D. handled

解析：本题考查动词词义。句意：很多人见证了世博会的开幕式，那场面十分壮观。witness目击，符合句意。