题目内容

Every Monday morning, students in our school would stand at attention, watching the national flag ______.
A.raisingB.risingC.being risenD.being raised
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。
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