Sometimes Alying is an Bessential weapon for self-protection, and this may be Ce

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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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SometimesAlyingisanBessentialweaponforself-protection,andthismaybeCe