单选题
60% of the population of the town ________ workers; things are different now.
A、
is
B、
are
C、
was
D、
were
【正确答案】
D
【答案解析】
[解析] 60%的人口为复数，和现在相比较，故前半句说的是过去。故本题答案为D。
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