For a successful business, friendly and________staff are essential.

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问题 For a successful business, friendly and________staff are essential.

选项 A、sufficient
B、effective
C、efficient
D、respective

答案C

解析 sufficient意为“足够的、富足的”;effective意为“有效的”;efficient意为“有能力的、有效率的”;respective意为“各自的、分别的”。所以答案选C。
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