单选题：Washoe could make signs to communicate __________.

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题目类型：单选题
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题目内容：

Washoe could make signs to communicate __________. A．if the Gardeners'argument was sound
B．because she was cleverer than other chimps
C．when she wanted to eat
D．while she was at a research center in Ellensburg
E．because she could use sign language to ask for fruits
F．while Washoe was learning sign language

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