单项选择题

There are many kinds of synthetic materials,______ plastics are the most common.

A．between which
B．of which
C．in which
D．among which
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单项选择题
______to speak when the audience interrupted him.
A．Hardly had he begun
B．No sooner had he begun
C．Not until he begun
D．Scarcely did he begun
单项选择题
She is ______a musician than her brother.
A．much of
B．much as
C．more of
D．more as
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