单项选择题

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
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单项选择题
_________at Harvard, he began to write his essay.
A．Busy was as he
B．Busy as was he
C．Busy as he was
D．As was he busy
单项选择题
Isn’’t that________ they call peace and friendship
A．which
B．this
C．what
D．where
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