Half of the workers here ________ under 30 ________.
A．is;yearsB．a(chǎn)re;year old C．is;years oldD．a(chǎn)re;years of age
D
half作主語時，謂語要與half后面的名詞保持一致。workers是復(fù)數(shù)，謂語也要用復(fù)數(shù)。
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