20．Now their peace talks have reached a key stagewhereone side must give in to the other．

分析 現(xiàn)在他們的和平會談到達(dá)一個關(guān)鍵階段，雙方彼此必須相互妥協(xié)．

解答 答案where．考查定語從句．遇到point，stage，occasion時，使用where表達(dá)抽象的一個點(diǎn)，也可用還原法，把a(bǔ) key stage放后面顯然句子要通順就得加個介詞in，構(gòu)成"one side must give in to the other （in a key stage）"．所以用where 表方位，并在從句中充當(dāng)狀語．

點(diǎn)評 考查單詞填空的題，瞻前顧后找關(guān)鍵詞，純空格題考慮代詞、冠詞、介詞、連詞．

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