【題目】 It’ll be another 50 years _________ China is expected to reach the level of a medium

developed country.

A. since B. before

C. that D. when

【答案】B

【解析】

試題分析:考查連詞。句義:五十年以后我國才有望達到中等發(fā)達國家的水平。It is+一段時間+before從句,過多久;遵循主講從現(xiàn)的原則,B正確。Since引導(dǎo)時間狀語從句,從句用一般現(xiàn)在時,主句使用現(xiàn)在完成時。故B正確。

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