单项选择题

The green turtle has been known ______ over 2,000 miles to return to a nesting site.

A．in the navigating
B．the navigation
C．to navigate
D．navigation
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单项选择题
______, both my father and mother died.
A．At the age of four
B．Being four years old
C．I was four years old
D．When I was four years old
单项选择题
At a press conference after the award ceremony, the 18-year-old girl spoke in a barely ______ voice.
A．audible
B．optional
C．legible
D．identical
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