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
Boris has brains. In fact, I doubt whether anyone in the class has ______IQ.
A．a high
B．a higher
C．the higher
D．the highest
单项选择题
—Would you like to go shopping with me —I'd like to,______ I'm too busy.
A．and
B．so
C．as
D．but
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