单项选择题

Learning to use computer is getting easier all the time because programs are designed to be convenient and are becoming readily __________ to computer users.

A．reasonable
B．available
C．approachable
D．attainable
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单项选择题
His misleading comments __________ to the confusion of audience over the problem under discussion.
A．extended
B．amounted.
C．added
D．turned
单项选择题
A group of angry parents had __________ outside the head teacher's office.
A．assembled
B．accumulated
C．piled
D．joined
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