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【参考答案】

that plugged→that were plugged
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22-seats→22-seat
单项选择题
A．three billion people in four yearsB．three million people in four yearsC．four million people in three yearsD．three million people in five years
A．three billion people in four years
B．three million people in four years
C．four million people in three years
D．three million people in five years
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