单项选择题
A.intB.stringC.numberD.boolean
A.onunloadB.onloadC.onblurD.onfocus
A.onclickB.onchangeC.onfocusD.onsubmit
A.document.writeln（"hello"）B.document.write（"hello\n"）C.document.write（"hello"）D.document.writeln（"hello\n"）
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