问题
选择题
Every Monday morning, students in our school would stand at attention, watching the national flag ______.
A．raising
B．rising
C．being risen
D．being raised
答案
D
考查非谓语动词。“升旗”raise a flag，旗帜是被升起所以用现在分词的被动式。句意为：每天早晨我们学校的学生立正看国旗升起。
