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问题:

[单选] The development of the light bulb ________partly as a result of the widespread availability of

A . occurring
B . was occurring
C . was occurred
D . occurred

参考答案:

  参考解析


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。【句子大意】灯泡的发展一部分是由于电力的广泛使用、对便宜和清晰光亮的需求。

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