问题描述：
be able to和can
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
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
问题解答：
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