单项选择题

Two boys were caught smoking in school but the principal let them ______ with a warning.

A．alone
B．off
C．in
D．out
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______ enough time and money, the researchers would have been able to discover more in this field.
A．Giving
B．To give
C．Given
D．Being given
单项选择题
In vain ______ to get in touch with the Embassy.
A．they tried
B．tried they
C．did they try
D．they have tried
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