单项选择题

I' m sorry to have taken up too much of your（）time.

A．worthy
B．valuable
C．valueless
D．struck

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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 salary of a taxi driver is much higher（）

A．than a worker
B．than that of a work
C．to compare as a worker
D．in comparison with a teacher
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