问题
选择题
Your bedroom is very dirty. You'd better _ at once. [ ]
A. clean up it
B. clean it up
C. set up it
D. set it up
答案
答案：B
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Your bedroom is very dirty. You'd better _ at once. [ ]
A. clean up it
B. clean it up
C. set up it
D. set it up
答案：B