单项选择题

Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks. ______ packages of food could be dropped from planes, the people might starve.

A．Until
B．Before
C．Unless
D．If only
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If ever again ______ happens an accident like this, we will have only ourselves to blame.
A．it
B．so
C．there
D．that
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The man in the corner confessed to ______ a lie to the manager of the company.
A．have told
B．be told
C．being told
D．having told
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