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【单选题】

—_____ have you been learning English?
— I have been learning English for six years.
[ ]

A.
How long
B.
How often
C.
How far
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参考解析:
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【单选题】—do you eat vegetable?—Every day.[ ]

A.
How long
B.
How often
C.
How many times
D.
How much