which, who, that; bacteria, bacterium, baceterias It was so large and complex _____ they initially assumed it was a_______.

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问题 which, who, that; bacteria, bacterium, baceterias
It was so large and complex _____ they initially assumed it was a_______.

选项

答案that,bacterium

解析 第一个空考查的是so…that…(如此……以至……)结构。第二个空考查的是名词的数,名词bacterium(细菌)的复数形式是bacteria,而不是bacterias。第二个空考查不规则复数名词,因空前有不定冠词a修饰,应选名词单数形式。答案为that,bacterium。
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