单项选择题

At last they _______ three figures moving in the distance.

A．turned out
B．made out
C．worked out
D．found out
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单项选择题
They were _______ in their scientific research, not knowing what happened just outside their lab.
A．submerged
B．immersed
C．dipped
D．drowned
单项选择题
As one of the youngest professors in the university, Miss King is certainly on the _______ of a brilliant career.
A．threshold
B．edge
C．porch
D．course
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