单项选择题

Some studies confirmed that this kind of eye disease was ______ in tropical countries.

A．prospective
B．prevalent
C．provocative
D．perpetual
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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．abused
C．neglected
D．discarded
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You ______ all these parcels yourself. The shop would have delivered them if you had asked them.
A．didn't need to carry
B．didn't have to carry
C．could not carry
D．needn't have carried
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