Period Twohad received语法感知本讲栏目开关语法感知知识储备had becomePeriod Two语法感知had ever been foundhad lefthad opened本讲栏目开关语法感知知识储备Period Two知识储备本讲栏目开关语法感知知识储备Period Two知识储备本讲栏目开关语法感知知识储备Period Two知识储备本讲栏目开关语法感知知识储备Period Two知识储备本讲栏目开关语法感知知识储备Period Two知识储备本讲栏目开关语法感知知识储备Period Two知识储备hadgothad workedmovedhadnt seenhad workedhad hoped本讲栏目开关语法感知知识储备