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【单选题】
A: How do you do? B: [填空]

Fine, thank you.
How do you do?
Not too bad.
Very well.
【单选题】
A: [填空]? B: Do you have a doll?

What do you want to sell
Shall I help you
Do you like a doll
What can I do for you
【简答题】
[a, b, c](ab, bc, ca) = [填空].

【简答题】
若 (a, b) = 1,则(a, bc) = [填空].

【单选题】
Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.

as
since
until
before
【简答题】
设P(A)=0.4,B为A的对立事件,则P(B)=[填空]

【简答题】
设P(A)=0.4,B为A的对立事件,则P(B)=[填空]

【简答题】
某全站仪测距标称精度为a+b.ppm,字母a,b分别表示[填空(1)]和[填空(2)]

【单选题】
A: Thank you for your invitation. B: [填空].

Its a pleasure
It doesnt matter
Its a small thing
Ill appreciate it
【单选题】
A: [填空]? B: Id like a cup of coffee.

What do you want
What are you looking for
What can I do for you
Do you want to buy anything