—Mum,  why have us eat much vegetable?
—Because it is _____ to our health.
A．benefitB．benefited
C．beneficialD．benefits
C
這題考查詞性：根據(jù)句子結(jié)構(gòu)，be動(dòng)詞后面應(yīng)該填形容詞，選C，句意是：媽媽，為什么讓我們吃那么多的蔬菜？--因?yàn)檫@對(duì)我們的健康有益。
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