【題目】You will fall behind others you work hard.
A.if
B.unless
C.though
D.since

【答案】B
【解析】句意：如果你不努力學習，你會落后別人。A.because因為；B. If如果；C. Unless如果不； D. Though雖然。結合句意，所以答案是B。

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