you never plan to visit the polar bears in the North Pole or the penguins in the South Pol

问题补充：

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

答案：

A. Until

B. Unless

C. As long as

(答案→)D. Even if

解析：本题考查连词。题意为“即便你从来没有计划到北极去看北极熊，到南极去看企鹅，现在也该考虑了”。even if即使；until直到；unless除非；as long as只要。