欧美日韩黄网欧美日韩日B片|二区无码视频网站|欧美AAAA小视频|久久99爱视频播放|日本久久成人免费视频|性交黄色毛片特黄色性交毛片|91久久伊人日韩插穴|国产三级A片电影网站|亚州无码成人激情视频|国产又黄又粗又猛又爽的

It seems that oil______from this pipe for some time.We’ll have to take the machine apart to put it right.
A．had leaked B．is leaking
C．leakedD．has been leaking
D
考查時(shí)態(tài)。現(xiàn)在完成進(jìn)行時(shí)表示從過(guò)去一直延續(xù)到現(xiàn)在的動(dòng)作，而且此動(dòng)作還有可能延續(xù)下去。
練習(xí)冊(cè)系列答案
相關(guān)習(xí)題

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

. All of the guests ___________ by 9 o’clock , but the host _____________ until 15 minutes later .
A．a(chǎn)rrived; didn’t turn up B．had arrived; didn’t turn up
C．a(chǎn)rrived; hadn’t turned up D．had arrived; hadn’t turned up

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

.—Do you like the material? 
—Yes, it ______ very soft. (MET1994 )
A．isfeelingB．feltC．feelsD．isfelt

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Mr.Wang ______ two boys to send the sick boy to the nearest hospital.
A．a(chǎn)rrangedB．has arrangedC．had arranged forD．has arranged for

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

—Could you meet me at the airport?—I’d like to，but I______Shanghai when you return.
A．will have left B．was leaving
C．will leave D．have left

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

He ______busy yesterday,or he______you with your experiment.
A．was;had helped
B．was;would have helped
C．had been;would have helped
D．were;would have helped

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

Enough______ to stop the forest______ since the 1980’s.
A．has been done;be cut down
B．has done;cutting down
C．has been done;being cut down
D．had done;from being cut down

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

I _____ to help you to do homework but I couldn’t spare any time. I _____ a composition last night and I’ll finish it today.
A．wanted; wroteB．had wanted; was writing
C．have wanted; wroteD．wanted; have been writing

查看答案和解析>>

科目：高中英語(yǔ) 來(lái)源：不詳 題型：單選題

— Why? Tom, your shirt is so dirty!
— Mum, I ＿＿ my storeroom downstairs。
A．cleanedB．have workedC．was cleaningD．have been cleaning

查看答案和解析>>

同步練習(xí)冊(cè)答案