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题库 / Prep2007E2-SC-119
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.
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
the types of fossilized algae that are present in core samples taken from the bottom of Lake Titicaca in the Andes, it was possible for a group of scientists
the types of fossilized algae that had been present in core samples taken from the bottom of Lake Titicaca in the Andes, that made it possible for a group of scientists
what types of fossilized algae had been present in core samples taken from the bottom of Lake Titicaca in the Andes, it was possible for a group of scientists
what the types of fossilized algae were that were present in core samples taken from the bottom of Lake Titicaca in the Andes, a group of scientists was able
after这里做连词，After determining是伴随状语
after 1997里after是介词
determine the levels (of calcium carbonate) and the types (of fossilized algae) ✅
determine the levels of calcium carbonate and what types of fossilized algae ❌
present 可以做adj
b that are present 冗余