问题
选择题
Half of the workers here ______ under twenty _______. [ ]
A. is; years
B. are; year old
C. is; years old
D. are; years of age
答案
答案：D
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Half of the workers here ______ under twenty _______. [ ]
A. is; years
B. are; year old
C. is; years old
D. are; years of age
答案：D