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
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Buses ______ very crowded, we had to go to school by taxi.
A．having been
B．are
C．being
D．were
单项选择题
______ you ______ further problems with your printer, contact your dealer for advice.
A．If, had
B．Have, had
C．In case, had
D．Should, have
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