单项选择题

Barbara did not have time to go to the concert last night because she was busy ______ for her lecture.

A．to preparing
B．to be prepared
C．preparing
D．being prepared
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单项选择题
Evidence came up ______ special speech sounds are recognized by babies as young as six months old.
A．what
B．that
C．which
D．whose
单项选择题
The president has got a quite good business ______ so the company has developed very quickly.
A．idea
B．sense
C．thought
D．thinking
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