—I’ll call you at 9 tomorrow morning, OK?

   —You’d better not, I ______ the piano then.

   A. will be practicing                                B. am about to practice

  am practicing                                D. practiced

—I’ll call you at 9 tomorrow morning, OK?

   —You’d better not, I ______ the piano then.

   A. will be practicing                                        B. am about to practice

  am practicing                                        D. practiced

—I’ll call you at 9 tomorrow morning, OK?

—You’d better not, I ______ the piano then．

A．will be practicing                                 B．am about to practice

C．am practicing                                      D．practiced

—I’ll call you at 9 tomorrow morning, OK?
—You’d better not, I ______ the piano then.
A. will be practicing                                        B. am about to practice
  am practicing                                        D. practiced

 —I’ll call you at 9 tomorrow morning, OK?

       —You’d better not, I ______ the piano then．

       A．will be practicing                                 B．am about to practice

       C．am practicing                                      D．practiced