In the past decades, sea ice _____in the Arctic as a result of global warming.
A．had meltedB．has been melting C．meltedD．is melting
B
考查時(shí)態(tài)。In the past decades通常都與現(xiàn)在完成時(shí)連用或者現(xiàn)在完成進(jìn)行時(shí)連用。句意：在過去的幾十年里，由于全球變暖，北極海冰一直在融化。
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

The popular film Golden Compass ____ an imaginary world.
A．set inB．is set inC．sets inD．is set on

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

He is the only one of the students who _____ a winner of scholarship for three years.
A．isB．a(chǎn)reC．have beenD．has been

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

She said the contest ________ by the Students’ Union the next Friday.
A．will be heldB．would be holding
C．would be heldD．was holding

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

—Mom, today I received a message telling me to send money to the account.
—Delete it. It’s a trick. Many a person ________ by such tricks.
A．have been cheated　　　B．were cheated
C．has been cheated　　　D．was cheated

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Sorry, I am too busy now. If I _____ time, I would certainly go for an outing with you.
A．have hadB．had hadC．haveD．had

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

By the time you have finished this book, your meal ______ cold.
A．getsB．has gotC．will getD．is getting

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Nearly half a million immigrants，many of them English—speaking，     in the country during the last quarter of the nineteenth century．
A．have arrivedB．had arrived
C．a(chǎn)rrived D．have been arriving

查看答案和解析>>

科目：高中英語 來源：不詳 題型：單選題

Remember not to telephone me after 7：30 pm, for I ____ the students in the classroom then.
A．will coachB．will be coaching
C．have been coaching D．have been coached

查看答案和解析>>

同步練習(xí)冊答案