—We can’t be successful ________ we keep working hard.

—We can’t be successful ________ we keep working hard.
—I agree with you.

A．if

B．unless

C．because

D．when

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一脸kk 春芽

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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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