Many provinces have been hit with smog. If _______ unsolved, the problem may lead to more serious results.
A．having left B．to leaveC．leftD．leaving
C

試題分析：句意：很多省份都遭遇了霧霾，如果任由問題不解決，它會導(dǎo)致更嚴(yán)重的后果。這里if條件句是省略式，完整的是If the problem is left unsolved，…，如果主從句的主語一致的話，可以省略從句的主語和be動詞，所以選C。
練習(xí)冊系列答案
相關(guān)習(xí)題

科目：高中英語 來源：不詳 題型：單選題

–- Helen, are you going to the airport to see Jack off the day after tomorrow?
-- _____________, I would go.
A．Were he to leave tomorrow
B．If he was about to leave tomorrow
C．Was he to leave tomorrow
D．If he would leave tomorrow

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

(2013·江蘇，27)“Never for a second，”the boy says，“________that my father would come to my rescue.”
A．I doubtedB．do I doubt
C．I have doubtedD．did I doubt

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

What would have happened ________，as far as up to the river bank.
A．Bob had walked farther
B．if Bob should walk farther
C．had Bob walked farther
D．if Bob walked farther

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

______ that we all think it worth the money.
A．Such fine furniture has he bought
B．So fine a furniture has he bought
C．Such fine furniture he has bought
D．So fine a furniture he has bought

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Next door to ours ______, who has achieved much in physics.
A．where lives an old scientistB．where does an old scientist live
C．lives an old scientistD．does an old scientist live

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Never______ such a difficult problem. It took me almost half an hour to work it out.
A．had I come across B．I had come across
C．did I come acrossD．I did come across

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

________ these experiments were successfully completed would we think of going into humans.
A．If onlyB．Only ifC．So that D．Even if

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Some green beans, ______ long enough, can be poisonous (有毒的).
A．if not be cookedB．if not cookedC．if not cookingD．if not being cooked

查看答案和解析>>

同步練習(xí)冊答案