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

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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