不同意82楼的说法 E应当是个倒装句 将trees 真正的主语放在后面是为了更好的对其进行解释说明 使their 和trees 照应的更紧密 而C中 their 和其指代的对象离的太远了 造成指代不明 应该选E 再问大家一道题11 Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers. A. scientists learned how to make a synthetic growth hormone, removing it painstakingly B. scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly C. scientist learned how to synthesize the growth hormone, it had to be painstakingly removed D. learning how to make a synthetic growth hormone, scientists had to remove it painstakingly E. Learning how to synthesize the growth hormone, it have to be painstakingly removed by scientists 分不清楚C D 的意思 NN帮忙解释一下! |