获取第一个form元素的方法有哪些？（）A、$（"form"）B、$（"form：eq（0）"）C、$（"form"）.eq（0）D、$（"form：first"）
获取第一个form元素的方法有哪些？（）
- A、$（"form"）
- B、$（"form：eq（0）"）
- C、$（"form"）.eq（0）
- D、$（"form：first"）
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