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The Cretan civilization was destroyed about 1400________,3,4

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The Cretan civilization was destroyed about 1400________,3,400 years ago.
The Cretan civilization was destroyed about 1400________,3,400 years ago.
(a) BC
(b) AD
填哪个,为什么?
Rome was invaded by the Goths in 410________,about 1,600 years ago.
(a) BC
(b) AD
填哪个,为什么?
老搞不清楚.
a) BC
bc 公元前
B ad 公元纪年