The immune system (protects) the body (by) recognizing and destroying (abnormally) or foreign cells, as well as (providing) anti

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问题 The immune system (protects) the body (by) recognizing and destroying (abnormally) or foreign cells, as well as (providing) antibodies to fight bacteria.

选项 A、protects
B、by
C、abnormally
D、providing

答案C改为abnormal

解析 形容词修饰名词cells。
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