问题
选择题
Sorry, you lost your purse; I hope it will some day.
A．turn out
B．show off
C．show up
D．turn up
答案
答案：D
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Sorry, you lost your purse; I hope it will some day.
A．turn out
B．show off
C．show up
D．turn up
答案：D
，∠C=45°，点P是BC边上一动点，设PB的长为x．