单项选择题

61（）

A．grew
B．was growing
C．grow
D．grown

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Some metals are better conductors of electricity than others,______ means that the former has atoms that contain more free electrons than the latter.
A．that
B．this
C．it
D．which
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I find this treatment very ______ to my health.
A．advisable
B．beneficial
C．invaluable
D．worthy
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