[单选题]The mother didn'tknow ______ to blame for the broken glass as it happened while she was out.
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2023-10-01 08:02:13
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[单选题]The mother didn'tknow ______ to blame for the broken glass as it happened while she was out.

A.who
B.when
C.how
D.what
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国家开放大学

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