问题
选择题
Do you know _____ ?
A. when was the flying disk invented
B. when the flying disk was invented
C. when did the flying disk invent
D. when the flying disk invented
答案
答案：B
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Do you know _____ ?
A. when was the flying disk invented
B. when the flying disk was invented
C. when did the flying disk invent
D. when the flying disk invented
答案：B