here are two pens,you can use__of themA both Beither说明原因好吗

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herearetwopens,youcanuse__ofthemAbothBeither说明原因好吗herearetwopens,youcanuse__ofthemAbothBeither说明原因好吗

here are two pens,you can use__of themA both Beither说明原因好吗
here are two pens,you can use__of them
A both Beither
说明原因好吗

here are two pens,you can use__of themA both Beither说明原因好吗
B 两个中的任意一个
而A是两个都要用