单项选择题

I must have hung （）for ten minutes before the telephone operator put me through.

A. up
B. round
C. on
D. over

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The language experts believe that the （）age for learning a foreign language is 6 years old.

A. conceptual
B. considerate
C. optimal
D. component
单项选择题
Contradictory to popular belief, recent surveys show that besides housewives, many college students are also（）to soap operas．

A．appealed
B．addicted
C．adjusted
D．attracted
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