单项选择题

Buses ______ very crowded, we had to go to school by taxi.

A．having been
B．are
C．being
D．were
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单项选择题
The standard of living of any country means the average person's ______ of the goods and services which the country produces.
A．amount
B．number
C．share
D．range
单项选择题
In this remote area ______ with a limited number of sheep and cattle.
A．can only a small farm be found
B．a small farm can only be found
C．only could be a small farm found
D．could only be found a small farm
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