【題目】Im busy with my schoolwork these days.

—Thats great! You wont get good grades _________________ you work hard.

A. if B. because C. unless D. after

【答案C

【解析】本題用邏輯推理法解題。分析主句和從句的關(guān)系可知從句是條件狀語(yǔ)從句,unless 除非,相當(dāng)于if not,故選C。

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