We have been waiting a long time.不用for a long time

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Wehavebeenwaitingalongtime.不用foralongtimeWehavebeenwaitingalongtime.不用foralongtimeWehavebeenwaitinga

We have been waiting a long time.不用for a long time
We have been waiting a long time.不用for a long time

We have been waiting a long time.不用for a long time
这里的for可以省略.
祝你进步