单选题Why was this notice posted?A There is an increased risk of getting an illness.B More health care workers are traveling abroad.C A new vaccination has been developed.D Influenza season is approaching.

题目内容(请给出正确答案)
单选题
Why was this notice posted?
A

There is an increased risk of getting an illness.

B

More health care workers are traveling abroad.

C

A new vaccination has been developed.

D

Influenza season is approaching.

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