With a population that is more informed and vocal, digital communications are ____ in bringing them together and giving them a platform to express themselves.
Asimultaneous
Bconcordant
Cinstrumental正確答案
Dfelicitous
答案與詳解
instrumental 意為「起關鍵作用的、有助益的」,固定用法 be instrumental in + V-ing,意指「在...方面發揮重要作用」,完全符合語意。
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