Our research has focused on a drug which is so _____ as to be able to change brain chemistry.
A．powerfulB．influentialC．monstrousD．vigorous
A
powerfu強(qiáng)有力的。在這里四個(gè)形容詞中, 只有powerful (有效力的) 可與表示藥物的名詞搭配。influential 有影響的, 有勢(shì)力的, monstrous 異常大的, vigorous 精力旺盛的,
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