People seek more_____ventilation facilities which can operate very quietly in ho

游客2025-06-18 20

问题 People seek more_____ventilation facilities which can operate very quietly in houses and buildings.

选项 A、compact
B、exceptional
C、effective
D、considerate

答案 C

解析本题应当选择适当的形容词。effective在这里是“有效的”的意思。

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