[单选题]It was not until the general introduction of __________ for transport, such as the Douglas DC-3, during the late 1930s that extensive takeoff and landing distances were needed.
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2023-10-01 08:01:18
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[单选题]It was not until the general introduction of __________ for transport, such as the Douglas DC-3, during the late 1930s that extensive takeoff and landing distances were needed.

A.cargo planes
B.heavy monoplanes
C.light monoplanes
D.seaplanes
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