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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Measles ______ a long time to get over.
A．spend
B．spends
C．take
D．takes
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The new aircraft ______ its tests very well.
A．experienced
B．hurried
C．supported
D．underwent
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