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un 解析 句意:直到離開家 , 他才開始了解家對他來說是多么重要 。 考查 not until 位于句首 , 主句要部分倒裝 , 排除 C, D兩項 。 答案 A 4. We laugh at jokes, but seldom________about how they work. A. we think B. think we C. we do think D. do we think 解析 句意:我們因為笑話而笑 , 但很少去想笑話使人發(fā)笑的原因 。 seldom 是否定意義的副詞 , 位于句首 , 主句要部分倒裝 。 答案 D 5. Had I known about this puter program, a huge amount of time and energy________. A. would have been saved B. had been saved C. will be saved D. was saved 解析 句意:如果我了解這種電腦程序的話 , 就可以節(jié)約大量的時間和精力 ??疾?if引導(dǎo)的虛擬條件句 。 前半句 Had I known about this puter program,是部分倒裝結(jié)構(gòu) , if省略提前 had, 可知是對過去時態(tài)的虛擬 , 主句應(yīng)用 would have done 結(jié)構(gòu) 。 答案 A 6. Unsatisfied ________ with the payment, he took the job just to get some work experience. A. though was he B. though he was C. he was though D. was he though 解析 句意:盡管對工資不滿意 , 但為了獲得工作經(jīng)驗 , 他接受了這份工作 。本題考查 though引導(dǎo)狀語從句可用倒裝形式的用法 , 從句中的表語 、 狀語或動詞原形置于句首 , 但主謂順序不變 。 本句可寫為: Though he was unsatisfied with the payment...。 答案 B 7. So sudden________that the enemy had no time to escape. A. did the attack B. the attack did C. was the attack