问题
选择题
The first color TV set was considered by most people________this century.
A．having been invented it
B．one of whom invented
C．who had invented it
D．to have been invented
答案
答案：D
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The first color TV set was considered by most people________this century.
A．having been invented it
B．one of whom invented
C．who had invented it
D．to have been invented
答案：D