Sometimes Alying is an Bessential weapon for self-protection, and this may be Cespecially true Dwhile war.

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问题 Sometimes Alying is an Bessential weapon for self-protection, and this may be Cespecially true Dwhile war.

选项 A、 
B、 
C、 
D、 

答案D

解析 While is an adverb. A preposition is needed before the noun war. Correction: during.
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