查人人中国名人网机动车驾驶人初次:2.She______in that room foran hour .((sing )
来源：百度文库 编辑：查人人中国名人网 时间：2024/04/28 14:50:35
has been singing ,现在完成进行时
has sung , 现在完成时
for an hour 表一段时间，所以用现在完成进行时或现在完成时
涌现在完成进行时强调持续，一直在做。
She (has sung) in that room for an hour .(sing )
has been singing
她已经在那个房间唱了一小时的歌了。（一个小时她一直在唱歌）
has been singing ,现在完成进行时,"她一直在唱,一小时了"
has sung , 现在完成时,"她已经唱了一小时了"
has been singing
has been singing .