I_____(sing) an English song at present .解释并说明理由

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I_____(sing) an English song at present .解释并说明理由
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I_____(sing) an English song at present .解释并说明理由
I_____(sing) an English song at present .解释并说明理由

I_____(sing) an English song at present .解释并说明理由
am singsing 因为“at present=now",所以要现在进行时

I _have__been__singing(sing) an English song at present .
我近期在唱一首英文歌。at present近期,对应的时态要用完成时。

at present表 目前,陈述事实。所以用sing原型 就好啦!

am singing at present 目前,用现在进行时