23. Every Monday morning, all the teachers and students in our school stand at ____ as our national flag is raised.
| A．attention | B．attentions | C．at ease | D．Attentively |
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23. Every Monday morning, all the teachers and students in our school stand at ____ as our national flag is raised.
| A．attention | B．attentions | C．at ease | D．Attentively |
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