问题描述：
they apologized for( )to attend the meeting
A their not being able B their being not able A group of student are playing violin ther,( ) their teacher as a ccnductor A in front of them stand B in front of them stands C in front ofwhom stands D in front of whom stand
A their not being able B their being not able A group of student are playing violin ther,( ) their teacher as a ccnductor A in front of them stand B in front of them stands C in front ofwhom stands D in front of whom stand
问题解答：
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