专四

单选题 The millions of calculations involved，__________by hand，would have lost all practical value by the time they were finished．

A．had they been done
B．they had been done
C．having been done
D．they were done

参考答案：A进入在线模考
A。数百万次的计算如果用手工操作，等到计算结束的时候，将失去其全部的实际意义。
考查虚拟语气。这是一个虚拟语气的句子，条件句使用了省略if的倒装句形式(还原后应为if they had been done)，动作与过去事实相反。

你可能感兴趣的试题

1 Televisions enable US to see things happen almost at the exact moment__________．

A．which they are happening
B．they are happening
C．which they happen
D．they have happened

点击查看答案进入在线模考
2 Which of the following is correct?

A．Not on any account should such disasters be repeated．
B．On no account should such disasters be repeated．
C．Not on any account such disasters should be repeated．
D．On no account such disasters should be repeated．

点击查看答案进入在线模考
3 According to the law which he later produced，everything in the universe attracts everything else towards__________.

A．it
B．everything
C．itself
D．each

点击查看答案进入在线模考

最新试题

Write on ANSWER SHEET THREE a note of about 50-60 words base

类型：简答题2014-02-26

In some countries young people are encouraged to work or tra

类型：简答题2014-02-26

What does the author suggest as the primary factor of formi

类型：单选题2014-02-26

What would the author benefit from the habit?

类型：单选题2014-02-26

The author would read the words aloud _________．

类型：单选题2014-02-26

What was the first new habit that the author would accompli

类型：单选题2014-02-26

根据以下资料，回答题：         

类型：单选题2014-02-26

Dried foods

类型：单选题2014-02-26

Nowadays vegetables are most commonly dried

类型：单选题2014-02-26

Alkaline solutions are used to

类型：单选题2014-02-26