单项选择题

The last half of the nineteenth century ______ the steady improvement in the means of travel.

A. has witnessed


B. was witnessed
C. witnessed


D. is witnessed
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单项选择题
He would rather ______ part in such dishonest business deals.
A. resign than take


B. resign than to take
C. resign than taking

D. resigning than take
单项选择题
You didn’t put on more clothes; otherwise you ______ cold.
A. wouldn’t have caught

B. wouldn’t catch
C. can’t catch


D. can’t have caught
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