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  3. Elephants have their own way to tell the shape of an object and______it is rough or smooth.

Elephants have their own way to tell the shape of an object and______it is rough or smooth.

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问题 Elephants have their own way to tell the shape of an object and______it is rough or smooth.
选项 A、/
B、whether
C、how
D、what
答案B
解析 从语法上分析，and后面的部分也应是tell的宾语，所以要填一个宾语从句引导词。what在从句中无成分可作，所以不合适；how则意义不对；而whether正合句意。
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