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题库 / Prep2007E2-SC-44
The survival of coral colonies, which are composed of innumerable tiny polyps living in a symbiotic relationship with brilliantly colored algae, are being threatened, experts say, not only by pollutants like agricultural runoff, oil slicks, and trash, but also by dropped anchors, probing divers, and global warming.
are being threatened, experts say, not only by pollutants like
are being threatened, experts say, by not only pollutants such as
is not only being threatened, experts say, by pollutants such as
is not only being threatened, experts say, by pollutants like
is being threatened, experts say, not only by pollutants such as
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句子主语：the survival of……，谓语动词单数，排除ab。
观察未划线部分but also by，保持平行，排除cd
e correct
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