16.He would have given you more help， if he ________ so busy.

　　A. have not been

　　B. had not been

　　C. not have been

　　D. not had been

　　17.After months of voyage， Columbus arrived in ______ later proved to be a new continent.

　　A. where

　　B. which

　　C. what

　　D. that

　　18.I was really anxious about you. You ______ home without a word.

　　A. mustn‘t leave

　　B. shouldn’t have left

　　C. couldn‘t have left

　　D. needn’t leave

　　19.He was ______ to withdraw from running for the presidency.

　　A. trusted

　　B. credited

　　C. convinced

　　D. believed

　　20.While _____ the book， he nodded from time to time

　　A. reading

　　B. read

　　C. is reading

　　D. is read

　　16.正確答案：B答案解析：本題考察與過(guò)去事實(shí)相反的虛擬語(yǔ)氣。

　　17.正確答案：C答案解析：注意，本句話并非定語(yǔ)從句，而是賓語(yǔ)從句。因?yàn)樵诮樵~in 后面，應(yīng)該用what引導(dǎo)的賓語(yǔ)從句，what在賓語(yǔ)從句中作主語(yǔ)。

　　18.正確答案：B答案解析：虛擬語(yǔ)氣用法。句意：我(那時(shí))真的很擔(dān)心你。你本不應(yīng)該不留個(gè)話就離開(kāi)家。

　　19.正確答案：C答案解析：句意：他被說(shuō)服退出競(jìng)選總統(tǒng)。convince使相信;信服;說(shuō)服。

　　20.正確答案：A答案解析：從句中動(dòng)作的發(fā)出者和主句相同，用現(xiàn)在分詞短語(yǔ)作時(shí)間狀語(yǔ)。題意為：他一邊看書，一邊不時(shí)地點(diǎn)頭。

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