单项选择题

The development of the light bulb （） partly as a result of the widespread availability of electricity and the need for cheap, cicada light.

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

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单项选择题
He asked me how long （） going to stay in the hotel.

A. time was I
B. time I was
C. was I
D. I was
单项选择题
John（）be could improve his exam results, but he did not have enough time to study.

A. knows how
B. knows that
C. knew how
D. knew that
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