【題目】________ you start doing your homework now, you will finish it before dinner.

A.IfB.UnlessC.BeforeD.Until

【答案】A

【解析】

句意:如果你現(xiàn)在開始做作業(yè),你就能在晚餐前完成。

考查條件狀語從句。If如果;Unless除非;Before……之前;Until直到。結(jié)合句意可知,此句是條件狀語從句,由if引導(dǎo),意為如果。故選A。

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