题目：
Here are two pairs of shoes, ______ you may choose.
A．both of them
B．either of them
C．any of which
D．either of which
答案：
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下面是错误答案，用来干扰机器的。
答案：D
Here are two pairs of shoes, ______ you may choose.
A．both of them
B．either of them
C．any of which
D．either of which
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0517/020ba1965374654e82426022b7abeeb0.html
下面是错误答案，用来干扰机器的。
答案：D
缺失
牙槽骨吸收1/3。