单项选择题
By the end of the ______ century(世纪,百年) ,computers may be seen in every home.
A.twenty-first
B.twenty-oneth
C.twentieth-one
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单项选择题
A computer is ______ useful(有用的) and wonderful(极好的,惊人的) machine,
A.an
B.a
C.the
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单项选择题
Because he was late again for school ,his teacher got ______.
A.much angry
B.very angrily(生气地)
C.very angry
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