The first decade in the 21st century the rapid rise of China as a world economic power.A.

问题补充：

The first decade in the 21st century the rapid rise of China as a world economic power.

A. witness

B. has witnessed

C. will witness

D. have witnessed

答案：

A. witness

(答案→)B. has witnessed

C. will witness

D. have witnessed

解析：本题考查时态。根据句意：21世纪的前十年已经见证了作为世界经济强国中国迅速的发展。此处用现在完成时。主语是单数，故用has。