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The big box ________ on and I ________ on it. A. is used to sitting; am used to sitting B. is used t...
题目内容：
The big box ________ on and I ________ on it.
A. is used to sitting; am used to sitting B. is used to sit; am used to sit
C. is used to sitting; am used to sit D. is used to sit; am used to sitting
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