His efforts to improve the sales of this product have been very(help)_为什么

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Hiseffortstoimprovethesalesofthisproducthavebeenvery(help)_为什么Hiseffortstoimprovethesalesofthisprodu

His efforts to improve the sales of this product have been very(help)_为什么
His efforts to improve the sales of this product have been very(help)_
为什么

His efforts to improve the sales of this product have been very(help)_为什么
helpful
他对提高产品销量所做的努力非常有效

helpful
他的努力是有用的……缺形容词……所以是helpful
话说楼主怎么老是你……回答不动了……闪了= =

helpful, 有帮助的意思