It is advisable to look for a professional consulting service when executives ar

游客2025-06-13 13

问题 It is advisable to look for a professional consulting service when executives are ______about future market trends.

选项 A、unknown
B、unavailable
C、unable
D、unsure

答案 D

解析词汇：形容词1．这是一道词汇题，选项均为形容词。2．空格内须填人一个可以受be动词和介词about修饰的形容词。内容上“当对于……没有自信或不确信”时需要professional consulting service(专业咨询服务)，因此(D)为正确选项。

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