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
______ you ______ further problems with your printer, contact your dealer for advice.
A．If, had
B．Have, had
C．In case, had
D．Should, have
单项选择题
Trade ______ for a country to exchange its surplus goods for some services abroad.
A．makes possible
B．takes it possible
C．get it possible
D．makes it possible
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