单项选择题

The Web browser is nice, but it also has its ______.

A．defects
B．faults
C．cracks
D．flaws
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单项选择题
American justice works on the ______ that an accused person is innocent until they are proved guilty.
A．allegation
B．pledge
C．premise
D．proclamation
单项选择题
He was ______ on the telephone so I asked him to speak more clearly.
A．muttering
B．compiling
C．groping
D．certifying
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