单项选择题

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

A．has witnessed
B．witnessed
C．is witnessed
D．has been witnessed
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单项选择题
She refused to _________ the door key to the landlord until she got back her deposit.
A．hand in
B．hand out
C．hand down
D．hand over
单项选择题
The pressure causes Americans to be energetic, but it also puts them under a constant emotional strain.
A．to compete
B．having competed
C．to be competed
D．competing
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