At last he finish the work ahead of time.A．couldB．was able toC．could have
题型：不详难度：来源：
At last he finish the work ahead of time.| A．could | B．was able to | | C．could have done | D．would have been able to |
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答案
| B |
解析
| 此句检测对can和be able to辨析使用的能力。从时态上讲，can只有过去，而be able to可用于各种时态；从语意上讲，be able to的过去可表示“设法完成某事”，相当于managed to do sth.而could则无此用法。 |
举一反三
He have come here yesterday, he?| A．mustn’t;did | B．couldn’t;has | C．mustn’t;haven’t | D．must;didn’t |
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Jack,you’re so lazy!This job hours ago.| A．should finish | B．must have finished | | C．ought to have been finished | D．was about to finish |
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If he had started at nine o’clock,he have been in London by eleven o’clock.| A．must | B．may | C．ought to | D．has to |
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He is taller than he .| A．used | B．used to be | | C．used to | D．used to do |
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- Do you know where my address book is?
- It________ be in the hall cupboard. I think I saw it this morning. |
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