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【单选题】
A: Will you be free tomorrow evening? B: [填空]

No,Ill be busy.
What is the matter?
Im sorry I wont be free then.
No,Ill have no time.
【单选题】
A: Sorry to bother you. B: [填空].

Thats okay
No, you cant
Thats good
Dont mention it
【单选题】
A: Are you feeling better today? B: [填空].

There must be something wrong
Just have a good rest
Yes, thank you, doctor. But I still dont feel good
Dont worry about me
【单选题】
A: [填空]? B: This is Franco Rossi speaking.

Who are you
Who are you calling
Who is that
What do you want to say
【单选题】
A: [填空], but is this the way to the library? B: Yes, it is.

Im sorry
Pardon
Excuse me
Hello
【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】
A: Long time no see, Mary. B: [填空] A: OK.

Well, how have you been?
How do you do?
Nice to meet you.
Fancy meeting you here.