20．-Congratulations on your winning first place in the competition!
-Thanks a lot!Without your encouragement and instruction，I_________ so well．（　�。�
A．didn't doB．couldn't have done
C．hadn't doneD．couldn't do

分析 --祝賀你在競(jìng)賽中獲得第一．
--多謝！沒(méi)有你的鼓勵(lì)和指導(dǎo)，我就不會(huì)做的那么好．

解答 答案：B．
分析句子結(jié)構(gòu)可知，這是without引導(dǎo)的一個(gè)含蓄虛擬條件句，是對(duì)過(guò)去事實(shí)的假設(shè)；所以主句中的時(shí)態(tài)使用could have done；故選B．

點(diǎn)評(píng) 本題考查虛擬語(yǔ)氣，要掌握與過(guò)去，現(xiàn)在，將來(lái)虛擬時(shí)的句型結(jié)構(gòu)并結(jié)構(gòu)具體的語(yǔ)境選擇出正確的答案．

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