Ms. Sofia Davis, president of Green Habitat Society, led an______lecture about t

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问题 Ms. Sofia Davis, president of Green Habitat Society, led an______lecture about the impact of global warming on the world’s ecosystems.

选项 A、instructs
B、instructionally
C、instruct
D、instructive

答案 D

解析用在不定冠词an与名词lecture之间可与其构成搭配的一定是形容词，因此选(D)instructive(有益的)。(A)与(C)为动词，(B)为副词，都无法与后面的名词搭配。

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