people are waiting to watch the raising of the national flag at Tian’an Men Square.A. Hun

问题补充：

people are waiting to watch the raising of the national flag at Tian’an Men Square.

A. Hundred

B. Thousand

C. Two hundreds

D. Thousands of

答案：

A. Hundred

B. Thousand

C. Two hundreds

(答案→)D. Thousands of

解析：考查数词。数词表示“许多”，可用hundreds of, thousands of等等，故选D。