单项选择题

A．In 17th century.
B．In the 50s, 17th century.
C．In 18th century.
D．In the 60s, 18th century.
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relief
单项选择题
A．Be ready to speed up.B．Be ready to slow down.C．Be ready to move to a slower lane.D．Be ready to move to a faster lane.
A．Be ready to speed up.
B．Be ready to slow down.
C．Be ready to move to a slower lane.
D．Be ready to move to a faster lane.
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