单项选择题

How long have the woman been working in the lab

A．Four years.
B．Just three years.
C．Almost three years.
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单项选择题
A．He is on holiday.B．He is out for lunch.C．He is on a trip.
A．He is on holiday.
B．He is out for lunch.
C．He is on a trip.
填空题
thought后加of
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