单项选择题

We must know such symbols ______ are used to represent the chemical elements.

A．that
B．what
C．which
D．as
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The joys of travel, having long ______ the disabled, are opening up to virtually anyone who has the means.
A．omitted
B．neglected
C．missed
D．discarded
单项选择题
Emily Dickinson's garden was a place ______ great inspiration for her poems.
A．that she drew
B．by drawing her
C．from which she drew
D．drawn from which
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