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He came back late ,         time all the guests had already left .

A．a(chǎn)fter which    B．by which   C．during which   D．a(chǎn)t which

He came back late ,　　　 time all the guests had already left .

A．a(chǎn)fter which 　 B．by which 　C．during which 　D．a(chǎn)t which

He came back late，        which time all the guests had already left．

      A．during                B．a(chǎn)t                        C．a(chǎn)fter                      D．by