—Oh, you have a headache and a cough. __________ have you been like this?
— Two days.
| A．How long | B．How often | C．How old | D．How many |
—Oh, you have a headache and a cough. __________ have you been like this?
— Two days.
| A．How long | B．How often | C．How old | D．How many |
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