17、Exactly ____they did when at last they reached the sea remains a complete mystery.

A．that              B．how             C．which                D．what  

17、D

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科目：高中英語 來源： 題型：

Exactly ____they did when at last they reached the sea remains a complete mystery.

       A. that    B. how    C. which D. what      

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科目：高中英語 來源： 題型：

Exactly ____they did when at last they reached the sea remains a complete mystery.

A．that              B．how             C．which                D．what  

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科目：高中英語 來源： 題型：

Exactly ____they did when at last they reached the sea remains a complete mystery.

A．that                            B．how                   C．which                  D．what

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