If not properly______, border issues which are always very sensitive and complicated international relations can often trigger c

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问题 If not properly______, border issues which are always very sensitive and complicated international relations can often trigger conflicts.

选项 A、handled
B、handing
C、handle
D、to handle

答案A

解析 本题考查if引导的状语从句的省略。if从句的主语与主句的主语一致,都为border issues,且从句主语后跟有动词be,通常可以省略if从句中的“主语+be”。从句的完整形式为:If border issues are not properly handled,…。故答案为handled。
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