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【单选题】
在国外教育技术的发展历程中,被作为视听教育的主要理论依据是( )A.
经验之塔理论
B.
传播学理论
C.
系统理论
D.
直观教学论
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A.
must be started
B.
ought to be started
C.
could be started
D.
should be started
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