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【单选题】
Select the correctly punctuated sentence.A.
The children's books were all left in the following places: Mrs Smith's room, Mr Powell's office and the caretaker's cupboard.
B.
The children's books were all left in the following places; Mrs Smith's room, Mr Powell's office and the caretaker's cupboard.
C.
The childrens books were all left in the following places: Mrs Smiths room, Mr Powells office and the caretakers cupboard.
D.
The children's books were all left in the following places, Mrs Smith's room, Mr Powell's office and the caretaker's cupboard.
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举一反三
【简答题】如何利用 Rf 值来鉴定化合物?
【简答题】如何利用 比移值(Rf值)来鉴定化合物?
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