问题
单项选择题
Well done and（）Thank you very much!
A.not at all.
B.congratulations to you.
C.that's right.
D.you are welcome.
答案
参考答案：B
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Well done and（）Thank you very much!
A.not at all.
B.congratulations to you.
C.that's right.
D.you are welcome.
参考答案：B
H
Ar和
Ca
O2和
O3
Cl和
Cl