【題目】Unless the weather ________, they will have to put off the school trip.

A. improves B. will improve

C. improved D. is improving

【答案】A

【解析】試題分析：句意：如果天氣沒有變好，他們將不得不推遲校園旅行。主句是一般將來時，unless引導(dǎo)的條件狀語從句遵循“主將從現(xiàn)”的原則。故選A。

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