Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (đề 25)

Gold in California in the 19th century. A. has been

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Mark the letter A, B, C, or D to indicate the correct answer to the following question.

Gold ______ in California in the 19th century.

has been discovered

was discovered

discovered

was discover