The boy is standing at the corner,He__(wait)for the bus. He

The boy is standing at the corner,He__(wait)for the bus. He __(wait)for the bus for half an hour.

新感觉 1年前已收到3个回答举报

9svxq 春芽

共回答了19个问题采纳率：84.2% 举报

第一个空填is waiting,表示他正在等公车,用现在进行时.
第二个空填has been waiting,表示他已经等了半小时了,而且这个动作还在继续,用现在完成进行时.

1年前

断浪007 幼苗

共回答了6个问题举报

is waiting 正在进行的动作
has been waiting 已经进行并还在进行的动作

1年前

dearfriendwang 幼苗

共回答了268个问题举报

is waiting 正在等
has been waiting 已经等了一段时间了，也许还会持续等下去

1年前

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