问题描述:
Half of the workers here _____ under 30 _____. A.is/years B.are/year old
Half of the workers here _____ under 30 _____. A.is/years B.are/year old C.is/years old D.are/years of age
为什么是D
Half of the workers here _____ under 30 _____. A.is/years B.are/year old C.is/years old D.are/years of age
为什么是D
问题解答:
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