用所给动词的适当形式填空.They are going to-----------(wait)for a bus.

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用所给动词的适当形式填空.They are going to-----------(wait)for a bus.
用所给动词的适当形式填空.They are going to-----------(wait)for a bus.

用所给动词的适当形式填空.They are going to-----------(wait)for a bus.
用动词原型,to do引导的是动词不定式.
你也可以当做固定短语来背be going to do sth.

过去式

be going to 后面 是动词原形,所以应该填 wait。