县级疾病预防控制机构对需要调查的疑似预防接种异常反应进行调查,调查开始后()初步完成疑似预防接种异常反应个案调查表?
A、1天
B、2天
C、3天
D、1周
参考答案:C
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
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