填空题

The problem was so complicated （） (花了我们两周时间才解决)．

【参考答案】

The problem was so complicated that it took us nearly two......

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填空题

The ship’s generator broke down, and the pumps had to （） (由手工操作而不是机械操作)．

单项选择题

A. using energy-efficient lighting
B. using natural lighting and ventilation
C. installing solar panels
D. building a wind farm