问题
选择题
If you want to do the experiment again, you'd better be more careful _____ you made a mistake. [ ]
A. when
B. why
C. that
D. where
答案
答案：D
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If you want to do the experiment again, you'd better be more careful _____ you made a mistake. [ ]
A. when
B. why
C. that
D. where
答案：D