After determining the levels of calcium carbonate and the types of fossilized algae present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able to reconstruct the history of precipitation in tropical South America over the past 25,000 years.
原句句子结构：After determining the levels of ...and the types of ..., a group of scientists was able to reconstruct the history of...
原句逻辑语义：在确定从 Lake Titicaca in the Andes底部采集回来的样品中碳酸钙的水平和藻类化石的类型，一些科学家们能够重建沉淀在热带南美洲过去25000年的历史。
B.主句应该要立马给出主语，it was possible...没有立马给出；
D.the levels of...and what types不平行；主句没有立马给出主语；
a group of scientists was????was????
是对的，很迷幻，a team of 是复数，a group of是单数
0 0 回复 2022-07-18 23:12:04
the levels of AND 后面一定是the types of，排除D、E。接着读我倾向that从句，再接着读，after determing后面的主句一定要有主语，看逗号后面的第一个词，分别是a group of sci, it, that。秒排B、C。
为什么a group of scientists后面加的是was？
a group of scientists后面＋单数吗？
为什么A 的present 不需要是presented？
0 0 回复 2018-07-16 21:17:19
笔记： and 前后结构的必须同为句子，同为名称 。必须对称
determining 的主语应该是a group of scientists，排除BCD
选项E （the levels of calcium carbonate） and （what the types of fossilized algae ）这里and前后不平行
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