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A.The apartment was very dirty.
B.He had his old furniture cleaned.
C.He found an apart with a big yard.
D.The furniture was very inexpensive.
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单项选择题A.Aviation and Transportation Security Act was passed.B.Ensuring the safety of passengers and aircraft became a major concern at airports.C.Airport security became the responsibility of the federal government.D.Security personnel required each passenger show photo identification before entering an aircraft.

A.Aviation and Transportation Security Act was passed.
B.Ensuring the safety of passengers and aircraft became a major concern at airports.
C.Airport security became the responsibility of the federal government.
D.Security personnel required each passenger show photo identification before entering an aircraft.

单项选择题A.Make up homework problems.B.Do research in the library.C.Teach an introductory economics course.D.Grade homework sets.

A.Make up homework problems.
B.Do research in the library.
C.Teach an introductory economics course.
D.Grade homework sets.