问题
选择题
. With the introduction of the computer, there is no complicated problem ________ can be solved in a few hours.
A．as
B．which
C．that
D．but
答案
答案：D
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. With the introduction of the computer, there is no complicated problem ________ can be solved in a few hours.
A．as
B．which
C．that
D．but
答案：D