There has been a lot of talk about whether or not face masks are effective in helping slow down the (25)______ of the COVID -19 coronavirus.Đoạn văn25/40There has been a lot of talk about whether or not face masks are effective in helping slow down the (25)______ of the COVID -19 coronavirus.releasewideninglengtheningspreadGiải thíchChọn đáp án D