Complete the sentences below. Use NO MORE THAN TWO WORDS from the passage for each answer. Cranes were operated manually becaus

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问题 Complete the sentences below.
Use NO MORE THAN TWO WORDS from the passage for each answer.
Cranes were operated manually because______created a risk of fire.

选项

答案steam power

解析 PARAGRAPH F ’Steam power could not be used for thecranes ... because of the danger of fire.’
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