单选题：(2013·湖南长沙四校二模)—Is the letter from your mother?—Yes..

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(2013·湖南长沙四校二模)—Is the letter from your mother?
—Yes.But she ________the letter herself，because she doesn’t even know one word.A．needn’t have written　B．can’t have writtenC．might not have writtenD．should not have written

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E-Commerce ______ mislead customers at times even though it's more convenient and faster in general.A．shallB．shouldC．canD．must

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