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, clean light.

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

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单项选择题
The plant is dead. I（）it more water.

A. will give
B. would have given
C. must give
D. should have given
单项选择题
What we have to take （）the courses offered only for this term.

A. are
B. is
C. have been
D. has been
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