living things are dying out quickly.Let's ask _____ destroying them in the past years.A.what part people have been playingB.what part people have played in为什么用完成进行时呢,in the past years不是应该选择现在完成时吗,而且强

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living things are dying out quickly.Let's ask _____ destroying them in the past years.A.what part people have been playingB.what part people have played in为什么用完成进行时呢,in the past years不是应该选择现在完成时吗,而且强

living things are dying out quickly.Let's ask _____ destroying them in the past years.A.what part people have been playingB.what part people have played in为什么用完成进行时呢,in the past years不是应该选择现在完成时吗,而且强
living things are dying out quickly.Let's ask _____ destroying them in the past years.
A.what part people have been playing
B.what part people have played in
为什么用完成进行时呢,in the past years不是应该选择现在完成时吗,而且强调造成的影响.还有是不是有这个词组play a part (in)doing sth呢,

living things are dying out quickly.Let's ask _____ destroying them in the past years.A.what part people have been playingB.what part people have played in为什么用完成进行时呢,in the past years不是应该选择现在完成时吗,而且强
现在完成进行时表示一直持续到现在,而且仍然有影响.
前半句给你提示,生物正在快速的灭绝,是现在进行时哦,现在完成时已经完成,对现在无影响!