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.____on his novel, the author decided to adapt it into a play.

A. Basing                    B. Based                  C. To base               D. Being based

.____on his novel, the author decided to adapt it into a play.

A. Basing      B. Based        C. To base    D. Being based

 ____on his novel, the author decided to adapt it into a play.

A. Basing           B. Based          C. To base        D. Being based

____on his novel, the author decided to adapt it into a play．

A．Basing          B．Based           C．To base          D．Being based