问题
选择题
It is only _____ your heart is really in it _____ you can play your best. [ ]
A. that; that
B. that; when
C. when; that
D. when; when
答案
答案：C
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It is only _____ your heart is really in it _____ you can play your best. [ ]
A. that; that
B. that; when
C. when; that
D. when; when
答案：C