-This problem is very difficult.       -I know,but Jack has           working it out. 

A．succeed in B．succeeds in C．succeeding in D．succeeded in

D

解析試題分析：句意：這道題非常難�！抑�，但是杰克已經(jīng)成功的計算出它來了。結(jié)合語境可知本句描述的是現(xiàn)在已經(jīng)完成的動作，故用現(xiàn)在完成時態(tài)。選Ｄ。
考點：考查時態(tài)

練習冊系列答案
相關(guān)習題

科目：初中英語 來源： 題型：單選題

There are four seasons in the year. And autumn_______ after summer.

A．will comeB．comeC．is comingD．comes

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

Ten years_______ since my uncle ________ to Ningbo.

A．have passed; wentB．passed; has gone
C．has passed; has goneD．has passed; went

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

—Have you seen my brother?
—Yes. I _____ him in the library five minutes ago.
A.have met        B. met            C.meet   

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

I ________a primary school student two years ago.

A．a(chǎn)mB．wasC．beD．were

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

 —How long has Henry’s father_______?—About two months.
A. bought the car B. been dead  C. joined the club    

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

On June 11th, 2013, Shenzhou-10 carrying three astronauts        into space from the space center in Jiuquan. All the Chinese people are proud of its successful launch.
A. sent up            B. are sent up            C. was sent up

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

The Dongying-Hainan airline         for about 5 months. I have taken the flights three times.

A．is open B．has opened C．has been open D．has been opened

查看答案和解析>>

科目：初中英語 來源： 題型：單選題

Miss Lin____________ a lot of work for the poor area since 2010.

A．does B．did C．has done D．will do 

查看答案和解析>>

同步練習冊答案