单项选择题

Find the missing number.7 9 8 10 9
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You should call the doctor in if _________.
A．swelling occurs in the region of the ears
B．the patient’s condition worsens after 2 days
C．the patient’s throat is still sore after a week
D．the disease spreads to another member of the family
多项选择题
How many languages are spoken all over the world
How many languages are spoken all over the world
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