The number of the workers here ___ 200. Half of them ____under 30 years old.
A．a(chǎn)re, areB．is, areC．a(chǎn)re, isD．is, is
B

試題分析：句意為：這里工人的數(shù)量是200人，一半在30歲以下。the number of+名詞復(fù)數(shù)，表示“---的數(shù)量”，謂語動詞應(yīng)用第三人稱單數(shù)形式。結(jié)合語境，“ half of them”指的是一半的工人，表示多數(shù)。根據(jù)主謂一致原則可知應(yīng)選B。
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