【題目】It is only when people live on à very limited diet_________ it is necessary to make a special effort to supply the missing vitamins.

A.soB.thatC.sinceD.until

【答案】B

【解析】

考查強調(diào)句。句意:只有當(dāng)人們以非常有限的飲食為生時,才有必要做出特別的努力來供應(yīng)缺少的維生素。分析句子結(jié)構(gòu)可知應(yīng)為it is +強調(diào)時間狀語+____+其他內(nèi)容,應(yīng)為強調(diào)句結(jié)構(gòu),因此所填空應(yīng)為that。故選B項。

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