问题
选择题
_____ you put your heart into your study, you'll feel _____ in it. [ ]
A. If; interesting
B. Once; interested
C. Since; interested
D. When; interesting
答案
答案：B
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_____ you put your heart into your study, you'll feel _____ in it. [ ]
A. If; interesting
B. Once; interested
C. Since; interested
D. When; interesting
答案：B