24．Yesterday evening I was playing the piano the doorbell rang. A．when B．before C．while D．a(chǎn)fter 【查看更多】

 

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Yesterday evening I was playing the piano          the doorbell rang.

A．when                         B．before                 C．while                  D．a(chǎn)fter

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Yesterday evening I was playing the piano ________ the doorbell rang．

[　　]

A．when

B．before

C．while

D．after

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