Question

I went there in 1984, and that was the only occasion when I ______ the journey in exactly two days.

I went there in 1984, and that was the only occasion when I ________ the journey in exactly two days.
A. must take B. must have made
C. was able to make D. could make

答案是c。我选了d..求解释.谢谢.

Answer 1

这里的解释是，所提及的事已经是过去时，真实发生过了的。

I went there in 1984, and that... 这个“that”和后面的“the only occasion”都是指“I went there in 1984”这件事。

所以简单地根据时态，都可以选出来是C, 一般过去时。

其他的选项都是用情态动词，都表示不是真实发生过的情况。

Answer 2

be able to 与can用法与区别

(1) be able to 强调努力而的能力，而can则强调自身已的能力。如：

She can sing the song in English. 她能用英语唱这首歌。

He will be able to sing this song in English in a few minutes, too. 几小时之后，他也能用英语唱这首歌。

(2) be able to 强调结果，而can只强调。如：

Luckily, he was able to escape from the big fire in the end. 幸运的是，他终于逃出了大火。

If he got here a few hours earlier, I could save him. 要是他早几小时来，我还能救他。

(3) be able to 可以有时态；而can现在和两种时态。如：

I could help you last night, but you didn’t come. 昨天晚上我能帮你，而你又没来。

Can you see it there? 你能看见它在那儿吗？

He is / was / will be able to help you. 他能帮你的忙
(4) can可用于表示性，推测，允许等情况，而be able to通常不

Answer 3

C. was able to make