赞题库-背景图

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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热门试题

单项选择题The government ______ regulations that put this old city under protection.

A．published
B．issued
C．discharged
D．released

单项选择题Unexpectedly the light ______ and we were left in darkness.

A．burn out
B．put out
C．turned out
D．went out