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The first textbooks _____for teaching English as a foreign language came out in the 16th century.

      A. having  written   B. to be written   C. being written   D. written  

The first textbooks _______ for teaching English as a foreign language came out in the 16th century.

A. having written              B. to be written  C. being written          D. written

The first textbooks ______ for teaching English as a foreign language came out in the 16th             century.

The first textbooks ______ for teaching English as a foreign language came out in the 16th century.

A. having written   B. to be written

C. being written              D. written

The first textbooks ______ for teaching English as a foreign language came out in the 16th             century.

A. to be written    B. written    C. being written    D. having written