设A={{a},{a,b,c},{b,d},{c,e}}
1. According to the time table, the train for London ___ at seven o’clock in theevening.
A) was leaving
B) has left
C) leaves
D) will leave
2. You should visit this part of the country when __________.
A) spring will come
B) spring comes
C) It has been spring
D) It will be spring
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