His wife died soon after gave birth to a son.
gave--giving
after是介词,后面接动名词。
9081交易选择“凭证正式挂失冻结”后,系统自动将账户凭证设置为“正式挂失”状态。
某采用高本振方式工作的接收机,工作时,接收频率为435.250MHz,中频为21.4MHz,此时接收机本振工作在()频率。