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—We can’t be successful ________ we keep working hard.
—I agree with you.      
A．if B．unlessC．because D．when
B
if是否，如果；unless除非，如果不；because因為；when既然，當……時。句意：如果我們不努力工作，我們就不能成功�！彝饽愕目捶�。結合語境可知選B。
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