________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that.
| A．Until | B．Unless | C．As long as | D．Even if |
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________you never plan to visit the polar bears in the North Pole or the penguins in the South Pole，now it is the proper time to start thinking about that.
| A．Until | B．Unless | C．As long as | D．Even if |
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