what were you doing when he arrived
问题描述:
what were you doing when he arrived
为什么是 when 不是while
when 和while 后面跟什么时态
答
arrive 是瞬间动词,不能和while 表示时间段的连词连用
when 时点,时段
while 时段
请及时采纳,不懂继续问( 天天在线 )
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