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
He did poorly in his examination,______ how hard he had studied for them.
A．considering
B．to consider
C．thinking
D．regarding
单项选择题
Possessing a car gives a much greater degree of______, enabling the driver to move around freely.
A．travelling
B．movement
C．mobility
D．freedom
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