鍥而舍之，朽木不折；鍥而不舍，金石可鏤。備考 也需要這樣持之以恒的精神。為您提供2020專升本考試英語知識點(diǎn)， 鞏固所學(xué)知識并靈活運(yùn)用，考試時(shí)會(huì)更得心應(yīng)手，快來看看吧！
虛擬語氣主要考察if引導(dǎo)的非真實(shí)條件句及倒裝，名詞性從句中的虛擬語氣，wish型虛擬語氣，It is (high) time的虛擬。
【實(shí)戰(zhàn)演練】
1. It's necessary the dictionary ______ immediately.
A. that he will return B. that he returned
C. that he return D. that he has returned
【答案】C。解析：考查的是虛擬語氣。句意：他必須立即歸還字典。本題中考查的是it is necessary that sb. (should) do的形式，should可以省略，這是對在名詞性從句中的虛擬語氣的考查。故選C。
2. Albert Einstein often stressed to interviewers that his accomplishments would certainly have been achieved by others lived.
A.he had never B.never had he
C.never he had D.had he never
【答案】D。解析：考查虛擬語氣條件句中省略if的用法。句意：阿爾伯特·愛因斯坦經(jīng)常對采訪者強(qiáng)調(diào)，如果沒有他，別人也會(huì)取得他的那些成就。根據(jù)句中would certainly have been achieved可知，本句是對過去情況的虛擬，所以if引導(dǎo)的條件句應(yīng)該用had done形式，由于從句中含有had，所以要省略if并把had提前，其他成分語序不變。
虛擬語氣主要考察if引導(dǎo)的非真實(shí)條件句及倒裝，名詞性從句中的虛擬語氣，wish型虛擬語氣，It is (high) time的虛擬。
【實(shí)戰(zhàn)演練】
1. It's necessary the dictionary ______ immediately.
A. that he will return B. that he returned
C. that he return D. that he has returned
【答案】C。解析：考查的是虛擬語氣。句意：他必須立即歸還字典。本題中考查的是it is necessary that sb. (should) do的形式，should可以省略，這是對在名詞性從句中的虛擬語氣的考查。故選C。
2. Albert Einstein often stressed to interviewers that his accomplishments would certainly have been achieved by others lived.
A.he had never B.never had he
C.never he had D.had he never
【答案】D。解析：考查虛擬語氣條件句中省略if的用法。句意：阿爾伯特·愛因斯坦經(jīng)常對采訪者強(qiáng)調(diào)，如果沒有他，別人也會(huì)取得他的那些成就。根據(jù)句中would certainly have been achieved可知，本句是對過去情況的虛擬，所以if引導(dǎo)的條件句應(yīng)該用had done形式，由于從句中含有had，所以要省略if并把had提前，其他成分語序不變。