单项选择题

That suggestion plan was never carded out because _______.

A．it was difficult
B．it wasn't right
C．not everyone agreed on the suggestion plan
D．electric power was too important to the country
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单项选择题
Which of the following statement is true according to the first paragraph
A．Edison received the first American patent.
B．Edison got the most patents in America at that time.
C．Edison was the only American inventor.
D．Edison was the first American inventor.
单项选择题
She still believes in him, ______ be has cheated her several times.
A．even though
B．because of
C．in spite of
D．therefore
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