________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．UntilB．UnlessC．As long asD．Even if
D　
本題考查連詞。題意為“即便你從來沒有計劃到北極去看北極熊，到南極去看企鵝，現(xiàn)在也該考慮了”。even if即使；until直到；unless除非；as long as只要。
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