问题
选择题
The mother didn't know ______ to blame for the broken glass as it happened while she was out. [ ]
A. who
B. when
C. how
D. what
答案
答案：A
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The mother didn't know ______ to blame for the broken glass as it happened while she was out. [ ]
A. who
B. when
C. how
D. what
答案：A