单项选择题

案例分析题 The sun’s heat()

A. makes the air move
B. makes the air still
C. makes the air cold
D. reflects back into space

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Mary wishes that she ()law instead of history when she was in college.

A.hadstudied
B.studies
C.hasstudied
D.studied
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()their luggage, the tourists hurried to the airport.

A. Packed     
B. After packed  
C. Having packed 
D. Packing
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