Now he _____ (wave) his arm towards Bill.这里用is waving还是waves?At the moment the taxi stops and the passenger gets off.Now he _____ (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!

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Now he _____ (wave) his arm towards Bill.这里用is waving还是waves?At the moment the taxi stops and the passenger gets off.Now he _____ (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!
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Now he _____ (wave) his arm towards Bill.这里用is waving还是waves?At the moment the taxi stops and the passenger gets off.Now he _____ (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!
Now he _____ (wave) his arm towards Bill.
这里用is waving还是waves?
At the moment the taxi stops and the passenger gets off.Now he _____ (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!

Now he _____ (wave) his arm towards Bill.这里用is waving还是waves?At the moment the taxi stops and the passenger gets off.Now he _____ (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!
您好,如果是单独一句话：
Now he is waving (wave) his arm towards Bill.
这里有 now 进行暗示是现在的动作,所以用现在进行时.
但你给出了上下文：
At the moment the taxi stops and the passenger gets off. Now he waves (wave) his arm towards Bill.It turns out to be Jim,Bill's best friend!
这里很明显要用一般现在时 waves,原因是前后句都在保持这个时态记叙同一个时间段发生的事情.Now在这里的意思是“叙事时发生的时间”,“当时”,不知道你理解了没.
希望对您有帮助,不懂的话可以继续提问.

now 很显然是现在进行时的标志
要用is waving

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