填空题

He (work)（）in that city for eight years before he moved here.

【参考答案】

had been working

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单项选择题

A．She is wandering.
B．She is thinking.
C．The man should wash the clothes.
D．She has already washed the clothes.

填空题

Why people can’t use all of the fresh waterBecause some of it is（）