Complete the sentence about Red River with the correct year: One of the earliest of them is the Thác Bà Dam in Vietnam, constructed in ______, which forms the Thác Bà Lake.

Answer and explanation

Correct answer: C. 1972

  1. Step 1: One of the earliest of them is the Thác Bà Dam in Vietnam, constructed in 1972, which forms the Thác Bà Lake. Answer: 1972. Why not the others: 1975, 1957 and 1969 don't fit.

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