Among the many dangers_-- sailors have to face , probably the greatest of all is fog .

A. which B. what C. where D. when

 

A

【解析】本題定語從句的先行詞是the many dangers，在定語從句中關(guān)系代詞which指代先行詞在句中作為動詞face的賓語，可以省略。CD兩項都是關(guān)系副詞，在定語從句中通常只作狀語，不能做賓語。What不是定語從句的關(guān)系詞。句義：在士兵面對的很多危險中，也許最大的危險是霧吧！故A正確。

 

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