Complete the sentence about Sơn Đoòng Cave with the correct year: The entrance to Hang Sơn Đoòng was found on December 10, ______ by a local man named Hồ Khanh, while searching for agarwood, a valuable timber.

Answer and explanation

Correct answer: A. 1990

The entrance to Hang Sơn Đoòng was found on 10 December 1990 by a local man, Hồ Khanh, while he was looking for agarwood. Its full extent was only explored later.

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