单项选择题

An old friend from abroad, ______ I was expecting to stay with me, telephoned from the airport.

A．that
B．which
C．whom
D．who
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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
单项选择题
The British constitution is ______ a large extent a product of the historical events described above.
A．within
B．to
C．by
D．at
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