The first text books____ 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

题目：The first text books____ 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

A、
B、
C、
D、