单项选择题

Many things ______ impossible in the past are common today.

A．considered
B．to consider
C．considering
D．to be considered
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单项选择题
The salesman showed us a ______ and told us that the equipment was just like those in the pictures.
A．catalogue
B．receipt
C．menu
D．bill
单项选择题
Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet.
A．have been
B．are
C．had been
D．were
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