问题
选择题
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
答案：B
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。