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I went there in 1984,and that was the only occasion when I _

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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
我选了d..
I went there in 1984,and that was the only occasion when I _
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.