作业帮an expert team --- to study h7n9 bird flu virus in april 2013a\ is set upb\ was set upc\ HAS SET UP请您说明理由好吗?
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/14 23:50:36
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an expert team --- to study h7n9 bird flu virus in april 2013a\ is set upb\ was set upc\ HAS SET UP请您说明理由好吗?
an expert team --- to study h7n9 bird flu virus in april 2013
a\ is set up
b\ was set up
c\ HAS SET UP
请您说明理由好吗?
an expert team --- to study h7n9 bird flu virus in april 2013a\ is set upb\ was set upc\ HAS SET UP请您说明理由好吗?
选B,研究团队是被组建,且时间在april 2013,表示发生在该文章完成之前.C的话要改为has been set up也是正确的