单选题：I have been trying to quit smoking.

题目内容：

I have been trying to quit smoking. A．give up
B．pick up
C．build up
D．take up

参考答案：

答案解析：

请在第(64)处填上正确答案。

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Paragraph 2____A．Changing work practice B．Not doing enough C．Closing city center

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根据材料，回答问题。Eat More, Weigh Less, Live LongerClever genetic detective work may hav

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