直到20世紀60年代才出現確鑿的科學依據,經常做一些慷慨的行為會對人們的情緒健康產生奇效。(It was ...)
It was not until the 1960s that solid scientific evidence emerged,and often doing some generous behavior would work wonders for people's emotional well-being.
It was not until the 1960s that solid scientific evidence emerged,and often doing some generous behavior would work wonders for people's emotional well-being.
【答案】It was not until the 1960s that solid scientific evidence emerged,and often doing some generous behavior would work wonders for people's emotional well-being.