单项选择题

M: Hello, Linda. Come in, please.
W: Thank you, Tom.
M: What can I do for you, Linda
W: I wonder if I can borrow your French-English dictionary.
M: Sure. It ought to be here on the bottom shelf. No, it isn’t here. Where can it be
W: Oh, don’t worry. If you can’t find it, I can buy one tomorrow.
M: It must be somewhere on these shelves. Oh, here it is on the top shelf.
W: Thank you very much. I’ll bring it back in a couple of days.

Where did Tom think he had put the dictionary at first（）

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