单项选择题

（）,the guest spealer was ushered into the auditorium hall to give the lecture

A.Being shown around the campus
B.Having shown to the campus
C.After been shown around thecampus
D.Having been shown around the campus

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单项选择题
Analytical and quantitative abilities, problem-solving（）and skill in the use of statistical methods and computers are all developed by studying economics--these place graduates at a considerable advantage on the job market.

A. aptitude
B. amplitude
C. altitude
D. multitude
单项选择题
He likes to swim （）

A. and playing football
B. and he also likes playing football
C. and to play football
D. and he likes to play football
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