求happen的用法!happen是否有进行时态?看例题:Now watch carefully and see what -- -------- in the experiment.(happen)

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求happen的用法!happen是否有进行时态?看例题:Nowwatchcarefullyandseewhat----------intheexperiment.(happen)求happen的用法

求happen的用法!happen是否有进行时态?看例题:Now watch carefully and see what -- -------- in the experiment.(happen)
求happen的用法!
happen是否有进行时态?
看例题:Now watch carefully and see what -- -------- in the experiment.(happen)

求happen的用法!happen是否有进行时态?看例题:Now watch carefully and see what -- -------- in the experiment.(happen)
happen有进行时态
is happening
现在认真观察看看在实验中正在发生什么