20．I will wait _____ 6：30，but then I'm going home．（　�。�
A．fromB．atC．afterD．until

分析 我會(huì)一直等到六點(diǎn)半，但是然后我就回家了．

解答 答案D
A項(xiàng)"來(lái)自，從"；B項(xiàng)"在…地點(diǎn)，場(chǎng)所"；C項(xiàng)"在…之后"；D項(xiàng)"直到""until 6：30"表示直到六點(diǎn)半，"until"用于肯定句中表示"做某事直到某時(shí)"，動(dòng)詞必須是延續(xù)性的．根據(jù)句子"but then I'm going home"可知，說(shuō)明我會(huì)一直等到 6：30，但是然后（6：30后）我就回家了．

點(diǎn)評(píng) 本題考查介詞辨析．解答此類題目首先要讀懂句意，理解每個(gè)選項(xiàng)介詞的意思，然后根據(jù)上下文語(yǔ)境鎖定合適的介詞．平時(shí)要加強(qiáng)介詞的積累．

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