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

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

19、D

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

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

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

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