单项选择题

Proper lighting is a necessary for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light.

A．needful
B．necessity
C．exigency
D．need
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单项选择题
In the past we were a lonely car maker, but we had good business, says Bernd Engelstadter, technical executive director at Shanghai Volkswagen, adding to he arrived in China seven years ago competition was not a problem .
A．that
B．when
C．that when
D．when that
单项选择题
We learned that Columbus has discovered America in 1492.
A．had discovered
B．discovers
C．discovered
D．was discovering
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