单项选择题

All of the tourists would have enjoyed themselves more if there ______ offers for free insurance policies.

A．were
B．have been
C．had been
D．should be
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单项选择题
Children tend to rely on ______ school friends to keep in touch with schoolwork.
A．concern
B．concerning
C．concerned
D．to concern
单项选择题
______, the two parties will have the same amount of luck to win the election.
A．All other things are equal
B．Were all other things equal
C．All other things being equal
D．If all other things were equal
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