【正文】
All of us can work out the question, because it’s too ,所以我們都能算出來。 in the 1960s 意思是 “20世紀(jì) 60年代 , 也可寫成 in the1960’s,其構(gòu)成為 : in the+年代 +s. ? 2. Since then, he has devoted himself to research and to the development of new varieties. ? since then意為“自那以后”,常用于現(xiàn)在完成時(shí)。 ? Since then, he has developed many good ,他養(yǎng)成許