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A. but B. and C. even D. 不填
【分析】此題容易誤選A，將漢語的“雖然……但是……”直譯為 although … but …，但是按英語語法，although 為從屬連詞，用以引導讓步狀語從句，它表明整個句子為復合句；而 but 在表示“但是”時，它是并列連詞，用以連接兩個簡單句使之成為并列句。由于在同一句中既用了從屬連詞 although，又用了并列連詞 but ，使得該句一半像復合句，一半像并列句，從而導致錯誤。正確的做法是，任意去掉 although 和 but 中的一個，使之要么成為復合句，要么成為并列句。其實，此題與上面一題的分析思路是一樣的。這里順便說一句，許多同學(包括
But I didn’t know that then, although I learned it later. 但我當時的確不知道此事，盡管后來我還是知道了。
此句既用了并列連詞 but，又用了從屬連詞 although，但它并未造成錯誤，原因是此句與上面所討論的情形有所不同，即此句 but 用于 although 之前，but 在此僅起到與上文轉折的作用，but 后的 I didn’t know that then, although I learned it later. 仍為一個復合句。
I tried doing the accounts, but although I knew some maths I found it very difficult. 我試著算這些賬，但盡管我懂點數學，仍感到很困難。
此句將 but 與 although 用在一起，但此句也沒有錯誤。該句從總體來看，它是一個以并列連詞 but 連接的并列句，而在該并列句的后面一句又是一個包含讓步狀語從句 although I knew some maths 的復合句——這種句型就是所謂的并列復合句。此句也可改寫為 I tried doing the accounts, but I found it very difficult although I knew some maths.
4. If they don’t understand it the first time, _________ over it again until they do.
A. going B. to go C. gone D. go
【分析】此題正確答案選D，其余幾項均有可能被誤選。空格前 if 引導的是一個條件狀語從句，而在空格處無論是填A、B或C，它都是一個非謂語動詞短語，而不是一個句子，這樣一來，整個句子沒有主句，從而導致結構不完整。若選D，則 go over it again until they do 則是一個句子(祈使句)，在此用作主語。又如：
(1) If he likes to eat it, _________ him some more.
A. give B. giving C. given D. to give
(2) If anyone calls, _________ them I’m not at home.(www.52ysedu.com)
A. tell B. telling C. told D. to tell
(3) When your mother comes back, _________ her to come to school at once.
A. ask B. asking C. asked D. to ask
(4) While the baby is sleeping, _________ your work as soon as possible.
A. finish B. finishing C. finished D. to finish
答案均選A，空格前分別為 if, when, while 引導的狀語從句，空格處填動詞原形，構成祈使句，用作句子主語。
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