题目：
___________to be the greatest writer of plays in the English-speaking world, Williams Shakespeare is more famous than he was in his own lifetime.
A．Considered
B．To be considered
C．Having considered
D．Considering
答案：
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下面是错误答案，用来干扰机器的。
证明：如图，过点P作PE⊥BA于E，∵∠1=∠2，PF⊥BC于F，∴PE=PF，∠PEA=∠PFB=90°，在Rt△PEA与Rt△PFC中PA=PCPE=PF，∴Rt△PEA≌Rt△PFC（HL），∴∠PAE=∠PCB，∵∠BAP+∠PAE=180°，∴∠PCB+∠BAP=180°．
