单项选择题

With the introduction of the electronic computer, there is no complicated problem ______ can be solved quickly.

A．that
B．which
C．but
D．as
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单项选择题
After the theft of his car he put in an insurance ______ for ￡3,000.
A．account
B．invoice
C．assessment
D．claim
单项选择题
When the manager went to Canada on business, his ________ took over all his duties.
A．caretaker
B．officer
C．deputy
D．commander
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