20．She came up with several ideas about the house decoration ________ a fantastic one struck her．（　　）
A．untilB．beforeC．sinceD．unless

分析 在想到一個(gè)極好的主意之前，她想出了幾個(gè)裝修房子的想法．

解答 答案：B．
考查從屬連詞．until 直到，before在…之前，since自從，unless除非．根據(jù)句意可知只有先有幾個(gè)想法，然后才有好主意才符合邏輯，故選B．

點(diǎn)評 本題考查介詞的用法．介詞的含義和用法是固定的，關(guān)鍵在于了解句意，選擇最符合語境的一個(gè)．

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