单项选择题

--Mark broke his leg when he was playing football.
--was that

A．Since when
B．Since when ago
C．How long
D．How long ago
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单项选择题
A．An engineer,B．A clerk.C．An animal doctor.
A．An engineer,
B．A clerk.
C．An animal doctor.
单项选择题
A．In an hour.B．In one and half an hour.C．In half an hour.
A．In an hour.
B．In one and half an hour.
C．In half an hour.
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