单项选择题

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

A．having been
B．are
C．being
D．were
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单项选择题
The scientist ______ most of his experiments if he had not run short of his fund.
A．would finish
B．had finished
C．would have finished
D．ought to have finished
单项选择题
Some of the national heroes would ______ some principle all their lives.
A．follow
B．take
C．carry
D．serve
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