這個(gè)and是多余的

請(qǐng)看下面的題：

When the last prize had been awarded _____ everybody cleared off.

A. and B. so

C. or D. 不填

【陷阱】容易想當(dāng)然地誤選A。

【分析】句首 when 引導(dǎo)的是一個(gè)時(shí)間狀語(yǔ)從句，它暗示整個(gè)句子為復(fù)合句；而so, and, or 為并列連詞，無(wú)論選哪一個(gè)，都表明整個(gè)句子為并列句，從而導(dǎo)致前后矛盾，所以A、B、C均不能選擇。此題正確答案選D，everybody cleared off 為整個(gè)復(fù)合句的主句。請(qǐng)看類(lèi)似例子(from www.網(wǎng)址未加載)：

(1) If wishes were horses, _____ beggars would ride.

A. and B. so

C. or D. 不填

(2) If I’m mistaken, _____ you are mistaken too.

A. so B. and

C. or D. 不填

(3) Just before I left London, _____ I sent him a telegram.

A. and B. so

C. or D. 不填

(4) After they had each said a few words, _____ Lloyd George took the floor.

A. and B. so

C. or D. 不填

答案均選D，空格前分別為 if, when, before, after 引導(dǎo)的狀語(yǔ)從句，空格后為整個(gè)復(fù)合句的主句。