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
John shut everybody out of the kitchen ______he could prepare his grand surprise for the party.
A．which
B．when
C．so that
D．as if
单项选择题
We thought of selling this old furniture, but we've decided to______ it. It might be valuable.
A．hold on to
B．keep up with
C．turn to
D．look after
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