问题
选择题
I don't know _____ by myself _____ I am alone at home . [ ]
A. how to do , when
B. what to do , when
C. how to do things ,but
D. what to do things , because
答案
答案：B
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I don't know _____ by myself _____ I am alone at home . [ ]
A. how to do , when
B. what to do , when
C. how to do things ,but
D. what to do things , because
答案：B