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  3. The development of the light bulb __ partly as a result of the widespread availability of electricity and the need for cheap, ci

The development of the light bulb __ partly as a result of the widespread availability of electricity and the need for cheap, ci

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问题 The development of the light bulb __ partly as a result of the widespread availability of electricity and the need for cheap, cicada light.
选项 A、occurring
B、was occurring
C、was occurred
D、occurred
答案D
解析 考的是语态和时态。讲的是过去的事情，用一般过去时。Development的出现或发生，可用主动态。选项D是正确的。
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