【題目】—We can't be successful ___________ we keep working hard.
—I agree with you.
A.if
B.unless
C.because
D.when

【答案】B
【解析】句意為我們不會(huì)成功，除非我們努力工作。unless=if...not，使主從句構(gòu)成條件關(guān)系。故選B。

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