单项选择题

The last half of the 19th century _________ the steady improvement in the means of travel.

A. was witnessed
B. has witnessed
C. witnessed
D. is witnessed
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单项选择题
When I first came to this country, I ______ that I should stay here so long.
A. little thought
B. thought little
C. thought never
D. a little thought
单项选择题
Laura would have been more considerate if she had change a little bit, ___________
A. hadn't she
B. hasn't she
C. wouldn't
D. didn't she
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