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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因为;when既然,当……时。句意:如果我们不努力工作,我们就不能成功。——我同意你的看法。结合语境可知选B。
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