问题
选择题
I have been ______ English ______ ten years. [ ]
A. study; for
B. studying; since
C. studying; for
D. to study; since
答案
答案：C
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I have been ______ English ______ ten years. [ ]
A. study; for
B. studying; since
C. studying; for
D. to study; since
答案：C