31. _____ salmon find their way back to their birthplace still remains a mystery to biologists.
(A) Which
(B) How
(C) Although
(D) Since

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統計： A(0), B(1), C(0), D(0), E(0) #4041932

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#7520569
考試重點 本題測驗名詞子句作為主詞的用法...
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