The first textbooks ______ for teaching English as a foreign language came out in the 16th century.
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A
having written
B
to be written
C
being written
D
written
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This kind of material can be used to _____plastics.
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A
taking the place of
B
take place of
C
taking place of
D
take the place of
Before he came , I’d finished _______ the whole book. 
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A
to read
B
to have read
C
reading
D
read