摘要：14．Nothing is difficult if you put your heart into it.
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Nothing is difficult if you put your heart into it, ?
[ ]
A. aren’t they
B. isn’t it
C. is it
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B. isn’t it
C. is it
Nothing is difficult if you put your heart into it, ______?
[ ]
A. are they
B. isn't it
C. is it
D. aren't they
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B. isn't it
C. is it
D. aren't they
Nothing is difficult if you put your heart into it, ?
A. are they B. isn’t it C. is it D. aren’t they
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