限时服务的办理时限自办税服务厅（）之日计算，涉税事项必须在规定的时限内办结或回复。
参考答案：正式受理
He said something bad him on April Fool's Day. [ ]
A. has happened on
B. had been happened to
C. had happened to
下为突触的亚显微结构图。
④⑤⑥合称突触，④为（），⑤为（）。
