—Can those? at the back of the classroom hear me?—No problem, sir !

A. seat????????????? ????????????? B.seatingC.seated????????????? ????????????? ????????????? ? D.sit

—Can those _____ at the back of the classroom hear me?
—No problem.

------Can those_____ at the back of the classroom hear me?

------- No problem.

A. seat    B. sitted    C. seated   D. sat

― Can those ____ at the back of the classroom hear me?

―No problem.

A. sit           B. sitting               C. seat                 D. seating

—Can those _________ at the back of the classroom hear me?

　　　　—No problem．

　　A．seat　　　　B．sit　　　　　C．seated　　　　D．sat