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[单选题]
(情景对话)()
A.Daily repairs keep the airplane safe
B.Daily repairs can bring down the maintenance cost
C.Daily repairs are necessary
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B、Daily repairs can bring down the maintenance cost
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A.Daily repairs keep the airplane safe
B.Daily repairs can bring down the maintenance cost
C.Daily repairs are necessary
B、Daily repairs can bring down the maintenance cost
A.Whether the maintenance cost is high
B.When will the man complete the program
C.How to reduce the cost
A.She has got there already
B.She will get there on time
C.She will get there at any time
A.London is the same as before
B.You will go to London and have a look
C.London has changed a lot
A.When to do c check and d check
B.how to do the c check and d check
C.how long times does c check and d check take