__________opening the meeting，the chairman asked the head of each subcommittee to make a brief report．

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问题 __________opening the meeting，the chairman asked the head of each subcommittee to make a brief report．

选项 A、Since
B、After
C、First
D、Past

答案B

解析 Afteropening the meeting，the chairman asked the head of each subcommittee to make a brief report．
会议开始后，主席要求各小组委员会的负责人做简短的报告。依句意，选(B)After“在……之后”。
而(D)Past表“超过……(时间)”，句意不合，
(A)Since“自从”为连词，后须接从句，(C)First“首先”为副词，在此语法不合。