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While dancing happily at home,_______________ ．

A．the door bell rang               B．the door bell rings

C．we heard the door bell rings     D . we heard the door bell ring

While dancing happily at home,        ．

A．the door bell rang                                        B．the door bell rings

C．we heard the door bell rings                         D．we heard the door bell ring

While dancing happily at home,        ．

A．the door bell rang                                        B．the door bell rings

C．we heard the door bell rings                         D．we heard the door bell ring

While dancing happily at home,        ．

A．the door bell rang            B．the door bell rings

C．we heard the door bell rings    D．we heard the door bell ring

While dancing happily at home，________．

A．the door bell rang          B．the door bell rings

C．we heard the door bell rings  D．we heard the door bell ring  

While dancing happily at home，________．

A．the door bell rang          B．the door bell rings

C．we heard the door bell rings  D．we heard the door bell ring  

（2010·北京八十中學高三9月月考）     25．While dancing happily at home,        ．

A．the door bell rang           B．the door bell rings

C．we heard the door bell rings    D．we heard the door bell ring