单项选择题

Once you get into the habit of smoking, you will find it extremely difficult to get out of it.

A．一旦你走进了抽烟习惯，你将发现走出来很难。
B．只要抽一次烟，你将发现很难走出来。
C．一旦你养成抽烟习惯，你将发现摆脱它很难。
D．养成抽烟习惯容易，你会发现摆脱它也不难。
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单项选择题
Einstein is so famous that there is no one who doesn't know him.
A．爱因斯坦并不有名，所以每一个人都不知道。
B．爱因斯坦是那样有名，以至于无人不晓。
C．爱因斯坦是那样有名，以致人人不知道。
D．爱因斯坦是那样有名，但几乎没有人不知道。
单项选择题
Lucy ______ English for six years by the end of last year.
A. had learned
B. learned
C. has learned
D. could have learned
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