单项选择题

I wonder why Jenny______ us recently. We should have heard from her by now.

A．hasn't written
B．doesn't write
C．won't write
D．hadn't written
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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
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
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