（ ）have been trying every way to keep the balance of nature.Man/Mankind/Human/Human beings选择哪一个?希望能够具体给出这几个词的辨析

I have been trying wang,wangxiaodong:We have been trying to reach you For you,I have been trying.意境如何 （）have been trying every way to keep the balance of natureA.ManB.MankindC.HumanD.Human beings the police ()to find the truth of the murder A.has being trying B.has been tried C.have been triedD.have been trying 英语翻译I have been trying .Because I love you.Please believe .I have been trying .Because I love you.Please believe . （ ）have been trying every way to keep the balance of nature.Man/Mankind/Human/Human beings选择哪一个?希望能够具体给出这几个词的辨析 We have been trying to reach you谁知道这句英文的汉语意思!呵呵. I have been trying hard to not only too far away from you “I'm sorry I have been trying to avoid”是什么意思、5财富、速来 I have been trying to get my room in order.为什么不是try?大神们帮帮忙 I have been trying to solve the problem try为什么用ing形式呢 i have been trying to find my way round ya'an ai have been trying to find my way round ya'an and get some shopping done怎麽翻译? All possible means____to save the wounded soldier A have been tried B is to be tried C has been tried Dare trying Though we have been staying up trying to finish the thing,there's still( ) work to do. A.mnyB.a plenty ot C.a large amount of D.a great number of 为什么选C?原因（详细） Been trying to reach you.是什么意思? For hundreds Of years,scientists have been trying to answer what things have an effect on people’速求此文翻译!please! have been