【题目】Many scientists have ________ been to the North Pole. （ ）
A. ever
B. already
C. yet
D. still
【答案】B
【解析】
句意：许多科学家……去过北极点。A曾经，B已经，用于肯定句，C已经，还，用于否定句的句尾，D仍然，have been to表示已经去过了，是肯定句，故选B.
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