单项选择题

M: You don’t look very well. What’s the matter with you
W: I have a headache.
M: How long have you been ill
W: Since last night.
M: Let me examine you and take your temperature.
W: Is it all right
M: It isn’t serious, but you need to take some medicine.
W: Thank you, doctor.

How long has the woman had a headache().

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