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：本題考察與過去事實相反的虛擬語氣。

　　17.正確答案：C答案解析：注意，本句話并非定語從句，而是賓語從句。因為在介詞in 后面，應(yīng)該用what引導(dǎo)的賓語從句，what在賓語從句中作主語。

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

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

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

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