问题:

能说明△ABC和△A 1B 1C 1相似的条件是(  )
A.AB:A1B1=AC:A1C1
B.AB:A1C1=BC:A1C1且∠A=∠C1
C.AB:A1B1=BC:A1C1且∠B=∠A1
D.AB:A1B1=AC:A1C1且∠B=∠B1

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