单项选择题

I don't doubt ______ the plan will be well-conceived.

A．that
B．why
C．whether
D．when
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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
We must know such symbols ______ are used to represent the chemical elements.
A．that
B．what
C．which
D．as
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