语法与词汇
I have been working diligently for the people _____.
A、
for dozen of years
B、
for a dozen year
C、
for dozens of years
D、
within one dozen year
【正确答案】
C
【答案解析】
句意：我已经勤勤恳恳为人民服务几十年了。for dozens of years几十年，dozen和year都要采用复数形式。
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