While watching television, . A．the doWhile watching television, . A．the doorbell rang B．the doorbell rings C．we heard

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While watching television, __________. A．the doWhile watching

While watching television, __________. A．the doWhile watching television, __________.  A．the doorbell rang  B．the doorbell rings  C．we heard
While watching television, __________. A．the do
While watching television, __________.
A．the doorbell rang  B．the doorbell rings
C．we heard the doorbell ring D．we heard the doorbell rings

While watching television, __________. A．the doWhile watching television, __________. A．the doorbell rang B．the doorbell rings C．we heard
c